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Integrated Modelling of Microstructure Evolution and Mechanical Properties Prediction for Q&P Hot Stamping Process of Ultra‑High Strength Steel

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Chinese Journal of Mechanical engineering 2020年第3期33卷 160-173页

作者： Yang chen Huizhen Zhang Johnston Jackie Tang Xianhong Han zhenshan {2. Institute of Forming Technology&Equipment School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200030China national engineering {2. center of die and mold cad Shanghai Jiao Tong UniversityShanghai 200030China.

High strength steel products with good ductility can be produced via Q&P hot stamping process,while the phase transformation of the process is more complicated than common hot stamping since two-step quenching and one-step carbon partitioning processes are *** this study,an integrated model of microstructure evolution relating to Q&P hot stamping was presented with a persuasively predicted results of mechanical *** transformation of diffusional phase and non-diffusional phase,including original austenite grain size individually,were considered,as well as the carbon partitioning process which affects the secondary martensite transformation temperature and the subsequent phase ***,the mechanical properties including hardness,strength,and elongation were calculated through a series of theoretical and empirical models in accordance with phase ***,a modified elongation prediction model was generated ultimately with higher accuracy than the existed Mileiko’s *** the end,the unified model was applied to simulate the Q&P hot stamping process of a U-cup part based on the finite element software LS-DYNA,where the calculated outputs were coincident with the measured consequences.

关键词： Q&P hot stamping Phase transformation model Microstructure evolution Product properties prediction

SIX SIGMA OPTIMIZATION IN SHEET METAL FORMING BASED ON DUAL RESPONSE SURFACE MODEL

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Chinese Journal of Mechanical engineering 2006年第2期19卷 251-255页

作者： LI Yuqiang cui zhenshan ZHANG Dongjuan RUAN Xueyu {2. Jun national die ＆ {2. cad engineering research center Shanghai Jiaotong UniversityShanghai 200030 China

Iterations in optimization and numerical simulation for the sheet metal forming process may lead to extensive computation. In addition, uncertainties in materials or processing parameters may have great influence on the design quality. A six sigma optimization method is proposed, by combining the dual response surface method （DRSM） and six sigma philosophy, to save computation cost and improve reliability and robustness of parts. Using this method, statistical technology, including the design of experiment and analysis of variance, approximate model and six sigma philosophy are integrated together to achieve improved quality. Two sheet metal forming processes are provided as examples to illustrate the proposed method.

关键词： Six sigma optimization Sheet metal forming Dual response surface

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金属材料热锻过程组织演化建模方法的新进展

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锻压技术 2021年第9期46卷 16-21页

作者：陈飞朱华佳李佳航崔振山上海交通大学模具cad国家工程研究中心上海200030

简要阐述了金属材料热锻过程中组织演变的建模与模拟方法;着重介绍了宏观有限元-介观多层级元胞自动机集成模拟方法,该方法以位错密度为线索,根据"应变/应变速率/温度-位错密度-再结晶-流动应力"之间的宏微观相互影响规律,能够追踪在非... 详细信息

简要阐述了金属材料热锻过程中组织演变的建模与模拟方法;着重介绍了宏观有限元-介观多层级元胞自动机集成模拟方法,该方法以位错密度为线索,根据"应变/应变速率/温度-位错密度-再结晶-流动应力"之间的宏微观相互影响规律,能够追踪在非均匀/非等温变形条件下,再结晶晶粒的形貌、尺寸和体积分数;同时,介绍了晶体塑性-多层级元胞耦合模拟方法,该方法以实际晶粒的取向为初始组织输入,采用晶体塑性描述晶粒内部变形的应变梯度,并将位错密度和晶粒取向映射到多层级元胞模型中,可以定量描述织构中大晶粒的形成;最后,较为简要地介绍了不锈钢核电大锻件的组织演变数值模拟-物理模拟方法,并归纳了几种方法的优缺点,展望了未来发展趋势。

关键词：热锻组织演变宏观有限元模拟多层级元胞自动机再结晶织构大晶粒