检索结果-内蒙古大学图书馆

3d processing map and high-temperature deformation behaviour of Fe-0.05C-0.015N-0.13P Steel

PROCEEdINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING 2022年第1期236卷 171-177页

作者： Mehta, Yashwant Rajput, S. K. Natl Inst Technol Srinagar Dept Met & Mat Engn Srinagar Jammu & Kashmir India Bundelkhand Inst Engn & Technol Dept Mech Engn Jhansi 284128 Uttar Pradesh India

Steels alloyed with high phosphorus should be developed for those applications where both strength and corrosion resistance are required. Structural steels such as rebars are manufactured using high-temperature deformation. Hence, thermo-mechanical behaviour of Fe-0.13P-0.05C -0.015N steel is considered using high temperature compression experiments after austenitization at 1050 degrees C for 10 s. The temperatures selected were between 750 and 1050 degrees C and at intervals of 50 degrees C. The rates of strain varied from 0.001 to 10 s(-1). Microstructural evolution was studied with the help of optical and scanning electron microscopy. Modified dynamic materials model is used to draw a processing map. The processing map helps in determining the domains which are safe for hot working. This alloy steel can be safely processed in the area confined by the rates of strain between 1 and 10 s(-1) as well as the temperature interval of 900 to 1000 degrees C.

关键词： Hot deformation steel 3d processing map optical microstructure dissipation power

来源：评论

学校读者我要写书评

暂无评论

3d processing map and hot deformation behaviour of a new type Al-Zn-Mg alloy

引用

PHILOSOPHICAL MAGAZINE 2020年第13期100卷 1716-1732页

作者： deng, Ke Sun, daxiang Tang, Weixue Cai, Zhizhi Zheng, Ruoju Zhou, Jinghui Guangdong Ind Anal & Testing Ctr Guangzhou 510650 Guangdong Peoples R China Cent South Univ Sch Mat Sci & Engn Changsha 410083 Hunan Peoples R China Guangdong Fenglv Alumina Co Ltd Foshan Peoples R China

The thermal compression behaviour of Al-Zn-Mg alloy was studied on a thermal simulator machine at the temperature range of 380-540 degrees C and strain rate range of 0.01-10 s(-1). The constitutive equation and 3d processing map of the alloys were established. The microstructure characteristics of the alloy were studied by metallographic observation, electron back-scatter diffraction (EBSd) analysis and transmission electron microscopy (TEM) microstructure analysis. The results show that the peak stress of high-temperature deformation of alloy decreases with the increase of deformation temperature and increases with the increase of strain rate. The dynamic recovery of the alloy occurs at the temperature range of 380-460 degrees C and the strain rate range of 0.01-0.1 s(-1). The dynamic recrystallization of the alloy occurs at the temperature range of 460-500 degrees C and the strain rate range of 0.01-0.1 s(-1). The alloy maintains fine and uniform recrystallized grains at a temperature range of 460-480 degrees C and a strain rate range of 0.01-0.1 s(-1), which is suitable for hot working.

关键词： Al-Zn-Mg alloy hot deformation 3d processing map microstructural evolution

来源：评论

学校读者我要写书评

暂无评论

Exploring the influence of Al content on the hot deformation behavior of FeMn-Al-C steels through 3d processing map

引用

VACUUM 2019年 159卷 447-455页

作者： Wu, Zhiqiang Tang, Yubo Chen, Wei Lu, Liwei Li, Eric Li, Zhichao ding, Hua Hunan Univ Sci & Technol Sch Mat Sci & Engn Xiangtan 411201 Peoples R China Univ Teesside Sch Sci Engn & Design Middlesbrough Cleveland England Shandong Univ Sci & Technol Sch Mat Sci & Engn Qingdao 266590 Peoples R China Northeastern Univ Sch Mat Sci & Engn Shenyang 110819 Liaoning Peoples R China

The effect of Al content on the hot deformation behavior of high-Mn low density Fe-Mn-Al-C steels was investigated by the 3d processing map at the temperatures of 850-1050 degrees C and the strain rates of 0.001-10s(-1). The high-Al steel showed a higher flow stress and a greater activation energy (443 kJ/mol) in contrast to the low Al steel (394 kJ/mol). The microstructures of 8Al steel and 10Al steel depends on the deformation parameters. The initial hot rolling microstructure has been displaced by the recrystallized structure and substructures for both steels, while the unstable zone has deformation bands and flow localization. As the Z content increases with increasing Al content, this leads to a significant inhibition of the dRX process, resulting in an unstable domain with deformation zones and flow localization. For high-Al steel, the morphology and distribution of ferrite transform from the continuous band ferrite to discontinuous granular ferrite, moreover, the flow localization features cannot be observed with the decrease of strain rate to 0.001s(-1). Furthermore, the proportion of instability region for each of the strains increases with the increasing of the Al content, the high Al content weakens the workability of the Fe-Mn-Al-C steels.

关键词： deformation behavior Low density steel 3d processing map Fe-Mn-Al-C

来源：评论

学校读者我要写书评

暂无评论

Hot deformation behavior and 3d processing map of super austenitic stainless steel containing 7Mo-0.46N-0.02Ce: Effect of the solidification direction orientation of columnar crystal to loading direction

引用

JOURNAL OF MATERIALS RESEARCH ANd TECHNOLOGY-JMR&T 2021年 13卷 618-634页

作者： Wang, Lin Li, Zhuoyuan Hu, Xin Lv, Bo Chen, Chen Zhang, Fucheng Yanshan Univ State Key Lab Metastable Mat Sci & Technol Qinhuangdao 066004 Hebei Peoples R China Yanshan Univ Sch Environm & Chem Engn Qinhuangdao 066004 Hebei Peoples R China Yanshan Univ Natl Engn Res Ctr Equipment & Technol Cold Rolled Qinhuangdao 066004 Hebei Peoples R China

In the present paper, hot compression tests on a super austenitic stainless steel (SASS) containing 7Mo-0.46N-0.02Ce were performed at temperatures of 900 degrees C-1200 degrees C and strain rates of 0.01-10 s(-1). The effect of angle between solidification direction of columnar crystal and loading direction (0 degrees, 30 degrees, 60 degrees, and 90 degrees) on the flow behavior and microstructure evolution of SASS was studied. Results showed that, samples with different columnar crystal characteristics and test conditions displayed various flow behaviors due to the difference in dynamic restoration softening mechanism, flow localization, and shear band formation. With the decrease of the angle between the solidification direction of columnar crystal and loading direction, the deformation activation energy (Q) and the In Z value of SASS decreased at the true strain of 0.7. It indicates that dynamic recovery (dRV) and dynamic recrystallization (dRX) are more likely to happen in the samples with low angles. The location and range of high efficiency of power dissipation (eta) region and instability region of the samples differed much with different columnar crystal characteristics. This means obviously different hot workability and microstructure evolution behaviors. At the true strain of 0.7, no negative eta-value region was observed in the 0 degrees sample, and the range of instability region was relatively small. On the whole, SASS presented the optimum hot workability when the angle between the solidification direction of columnar crystal and loading direction was 0 degrees. (C) 2021 The Author(s). Published by Elsevier B.V.

关键词： Super austenitic stainless steel Columnar crystal Constitutive model 3d processing map Finite element simulation

来源：评论

学校读者我要写书评

暂无评论

Hot deformation characterization of Ti-Nb alloy based on GA-LSSVM and 3d processing map

引用

JOURNAL OF MATERIALS RESEARCH ANd TECHNOLOGY-JMR&T 2021年 13卷 1083-1097页

作者： Wan, Peng Zou, Hang Wang, Kelu Zhao, Zhengzhi Univ Sci & Technol Beijing Collaborat Innovat Ctr Steel Technol Beijing 100083 Peoples R China Univ Sci & Technol Beijing Beijing Lab Metall Mat & Proc Modern Transportat Beijing 100083 Peoples R China Beijing Engn Technol Res Ctr Special Steel Traff Beijing 100083 Peoples R China Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China Nanchang Hangkong Univ Sch Aeronaut Mfg Engn Nanchang 330063 Jiangxi Peoples R China

The thermal compression tests of Ti-Nb alloy under T = 790-940 degrees C and (epsilon)over dot = 0.001-10s(-1) were carried out on the thermal simulation testing machine of Gleeble-3500. The flow stress curves were obtained, and the high-temperature rheological properties of the alloy were analyzed. The 3d activation energy maps were calculated and constructed. The LSSVM model of constitutive relation was established, and the penalty coefficient gamma and kernel parameter delta of the LSSVM model were optimized by the genetic algorithm (GA). The constitutive model of the alloy based on the GA-LSSVM algorithm was constructed. The predicted value of the model was also compared with the experimental data. The polar reciprocity model (PRM) and dynamic material model (dMM) were used to establish the 3d processing map of the alloy and appropriate thermal processing parameters. The results indicated that T and (epsilon)over dot have a great influence on the flow stress of Ti-Nb alloy. Ti-Nb alloy is a negative temperature-sensitive and a positive strain rate-sensitive material. The correlation coefficient (R) of the GA-LSSVM algorithm constitutive model is 0.9958. The model has high prediction accuracy and strong generalization ability, which provide a new method for establishing a high-temperature constitutive model of materials. The PRM processing map is more accurate in optimizing the processing parameters of Ti-Nb alloy than that of the dMM processing map through analyzing the 3d processing map and observing the microstructure. The instability modes in the instability region of the alloy mainly include local flow. The stability region's predominant deformation mechanism is dRX. The 870-940 degrees C and 0.001-0.01s(-1) are the best parameters during the processing of Ti-Nb alloy. (C) 2021 The Authors. Published by Elsevier B.V.

关键词： Ti-Nb alloy LSSVM Genetic algorithm 3d processing map dRX

来源：评论

学校读者我要写书评

暂无评论

dynamic Response and Microstructural Characterization of Al3Zr/Al Composite Using 3d processing map

引用

JOURNAL OF MATERIALS ENGINEERING ANd PERFORMANCE 2024年第2期33卷 751-762页

作者： Raja, Nitish Sinha, Mrinmoy Gautam, Gaurav IITK Dept Mat Sci & Engn Kanpur 208016 UP India IITR Dept Met & Mat Engn Roorkee 247667 UK India Grap Era Hill Univ Dept Phys Dehra Dun 248001 UK India

In the present work, Al3Zr/Al composite was fabricated through the in situ route. The fabricated composite was isothermally forged in the temperature and deformation rate range of 300-450 degrees C and 0.001-1 s(-1) to a true strain of 0.69. The flow stress behavior of the forged specimen decreased with the increase in temperature and decrease in the deformation rate. The kinetic rate calculation indicated an average hot deformation activation energy of 196 kJ/mol. The workability map showed a maximum power dissipation of 43% in a narrow working zone of 442-450 degrees C, 0.001 s(-1). Another working zone II with an efficiency value of > 34% is observed in 386-403 degrees C, 0.047-0.02 s(-1). Microstructural instabilities during hot forging are mostly observed at lower temperatures and higher strain rates regions, which are micro-crack, flow localization, particle cracking, and debonding. The EBSd analysis indicated a higher fraction (>= 55%) of strain-free grains in the peak dissipation efficiency region (400 degrees C, 0.1 s(-1), and 450 degrees C, 0.001 s(-1)). The boundary misorientation analysis confirmed the occurrence of dynamic recovery (dRV) and continuous dynamic recrystallization (CdRX) during hot forging. dynamic softening is also supported by PSN and is dominant in the Al3Zr and matrix interface.

关键词： 3d processing map aluminum alloy hot forging microstructural evolution strain inhomogeneity

来源：评论

学校读者我要写书评

暂无评论

Strain rate affects the deformation mechanism of a Ti-55511 titanium alloy: Modeling of constitutive model and 3d processing map using machine learning

引用

MATERIALS TOdAY COMMUNICATIONS 2024年 40卷

作者： Xiao, Yangzhihong deng, Yechen An, Yixin Yuan, Li Zhan, Xiaodong Wang, Bingfeng Cent South Univ Sch Mat Sci & Engn Changsha 410083 Peoples R China Cent South Univ State Key Lab Powder Met Changsha 410083 Peoples R China

The constitutive model and processing map are effective tools for analyzing the hot deformation behavior of titanium alloys. The stress-strain curves of the Ti-5Al-5Mo-5V-1Cr-1Fe alloy were obtained through the Gleeble thermal simulation experiment. The deformation microstructures at different strain rates were characterized by EBSd and TEM. According to the stress-strain curve, the constitutive models were established by using the Arrhenius equation and the BP artificial neural network (BP-ANN). The constitutive model constructed by BP- ANN has higher fitting accuracy, with the Pearson's R of 0.99902 and the mapE of 5.499%. The 3d processing map of the Ti-55511 alloy was constructed by the BP-ANN constitutive model, which takes temperature, strain, and strain rate as variables. In the processing map, the deformation mechanism is dynamic recovery when the power dissipation efficiency is 0.2-0.33, and the deformation mechanism is dynamic recrystallization when the efficiency is 0.33-0.5. At temperatures of 1123 K and 1153 K and the strain of 0.4, the deformation mechanism is dynamic recovery at the strain rate of 1 s- 1 . At the strain rate of 0.1 s- 1 , the deformation mechanism is dynamic recrystallization. This is due to the fact that the higher strain rate prevents dislocations from rearranging, thereby inhibiting dynamic recrystallization behavior.

关键词： Titanium alloy Microstructure BP-ANN 3d processing map deformation mechanism

来源：评论

学校读者我要写书评

暂无评论

Microstructural and mechanical characteristics of hot worked homogenized AA7068 using 3d processing map and dEFORM-3d

引用

MATERIALS TOdAY COMMUNICATIONS 2023年 36卷

作者： Raja, Nitish daniel, B. S. S. Indian Inst Technol Roorkee Dept Met & Mat Engn Roorkee India Indian Inst Technol Kanpur Mat Sci & Engn Kanpur India

AA7068 is classified as high strength aluminum alloy and is primarily utilized in wrought conditions which can be achieved with hot deformation. The process of hot deformation is a competent way of optimizing material properties;thus, understanding its deformation behavior in the wide range (250-450 degrees C, 10- 3-100 s-1) is vital in processing a high-performance product. The true stress-true strain trend indicated its dependence on thermomechanical variables and precipitate size. The constitutive calculations accurately predicted the flow stress behavior. The kinetic rate calculations demonstrated that glide dislocation motion (with a value of n = 6.3) was observed during hot deformation. 3-dimensional processing map (PM) has revealed a progressive rise in efficiency (& eta;) with increase in true strain. The PM analysis has successfully identified both stable and unstable working regions. Within the stable working region, a peak efficiency (& eta;) of 54% was observed in the range of 347-359 degrees C and 10-3 s-1, 0.69 true strain. In, the stable working region, the microstructural characteristics demonstrated a notable increase in the dynamic softening depending on the process time and deformation temperature. At lower temperatures, the dynamic softening in the deformed specimens predominantly occurred through dynamic recovery (dRV), whereas at high temperatures, it facilitated by dynamic recrystallization (dRX). The dRX during deformation was observed to occur through continuous dynamic recrystallization (CdRX) and particle stimulated nucleation (PSN) mechanism. Hot forging finite element modeling (FEM) exhibited an uneven material flow with the peak effective strain occurring in the core of the specimen. Open forging in the optimum working conditions resulted in the highest tensile strength of 340 MPa, observed at a temperature of 450 degrees C and strain rate of 10-3 s-1.

关键词： Aluminum alloy Hot compression EBSd TEM 3d processing map dEFORM-3d

来源：评论

学校读者我要写书评

暂无评论

Novelty 3d processing maps of GH4175 superalloy to predict the instability deformation and optimal processing parameters

引用

JOURNAL OF MATERIALS RESEARCH ANd TECHNOLOGY-JMR&T 2025年 36卷 2017-2032页

作者： Li, Yueqian Luo, Jiao Zhang, Zhigang Li, Hong Northwestern Polytech Univ Sch Mat Sci & Engn Xian 710072 Peoples R China

In this paper, a novel 3d processing map is developed by the three-dimensional cubic spline interpolation method. This 3d processing map is capable of reflecting the continuous variation of the efficiency of power dissipation and instability parameter as the processing parameters change. It is used to predict the instability deformation and optimal processing parameters during the hot deformation of GH4175 superalloy. The results indicate that the instability deformation is mainly contributed to the adiabatic shear band (ASB) and flow localization. The average grain size inside ASB, in transition region and outside ASB is similar to 200 nm, similar to 1 mu m and similar to 2 mu m, respectively. The grain refinement of GH4175 superalloy inside ASB is motivated by Rotational dynamic Recrystallization (RdR) and is also further accelerated by discontinuous dynamic Recrystallization (ddRX) and Hetero-epitaxial Recrystallization(HERX). Based on the prediction of 3d processing map, the deformation temperature ranging from 1052 degrees C to 1100 degrees C, the strain rates ranging from 0.001 s(- 1) to 0.067 s(- 1) and the strains ranging from 0.1 to 0.69 are chosen as the optimum processing parameters during isothermal compression of GH4175 superalloy. A perfect superplastic behavior with a high elongation of over 260 % for GH4175 superalloy is verified at this region.

关键词： Superalloy 3d processing map Adiabatic shear band Rotational dynamic recrystallization processing parameters optimization Superplastic behavior

来源：评论

学校读者我要写书评

暂无评论

An investigation of constitutive modeling and 3d processing maps of Mg/HA composites for orthopedic applications

引用

JOURNAL OF MATERIALS RESEARCH ANd TECHNOLOGY-JMR&T 2022年 19卷 3894-3915页

作者： Kasaeian-Naeini, M. Sedighi, M. Hashemi, R. delavar, H. Iran Univ Sci & Technol Sch Mech Engn Tehran Iran

The hydroxyapatite particles as reinforcement materials have been widely considered to produce magnesium biocomposites used in biodegradable implants. However, Mg/HA biocomposites, which show poor ductility at room temperature due to their intrinsic properties, must be deformed at elevated temperatures. Thus, optimum hot deformation conditions of Mg/HA biocomposites can improve the corrosion behavior of these materials in addition to their mechanical and microstructural properties. In the present study, the high-temperature deformation behavior of Mg/1wt.% HA and Mg/2.5 wt.% HA biocomposites have been scrutinized using compression tests in the temperature ranges of 523-673 K and strain rates between 0.005 and 0.1 s-1. The true stress-true strain diagrams, constitutive analysis, 3d processing map for power dissipation efficiency and instability in the strains from 0.1 to 0.6, and microstructural observations were assessed for both biocomposites. The results indicated that the proposed constitutive model could predict the Mg/HA biocomposites' high-temperature deformation behavior with adequate accuracy. The activation energy which obtained from constitutive equations for both Mg/1wt.% HA and Mg/2.5wt.% HA biocomposites were identified to be 256.302 Kj/mol and 224.798 Kj/mol, respectively. According to 3d processing maps, the highest value of power dissipation efficiency for Mg/1wt.% HA has occurred in the strain of 0.2, strain rate of 0.005 s-1, and temperature of 573 K;however, for Mg/2.5wt.% HA, it has located at the strain, temperature, and strain rate of 0.3, 530 K, and 0.09 s-1, respectively. The microstructural characterizations showed more dynamic recrystallization occurrence in Mg/2.5wt.% HA than the Mg/1wt.% HA biocomposite. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC

关键词： Magnesium hydroxyapatite biocomposite Hot deformation Constitutive analysis 3d processing map Microstructure evolution

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：