摘要
提出了一种系统获取热处理模拟参数的实验方法。该方法基于热处理过程的应变分解原理,通过试样均匀热影响区的变形分析,把热循环过程过程分为不发生相变、无应力相变、有应力相变3种情况,逐步分离得到了弹性应变、热应变、经典塑性应变、相变应变和相变塑性应变,用于确定热膨胀系数、塑性参数、相变膨胀系数、相变动力学参数及相变塑性参数。给出了某中碳低合金钢热处理参数的实验分离方案。采用13组等温拉伸实验确定了3种组织的塑性参数;采用无应力热循环实验确定了相变动力学参数、相变膨胀系数及3种组织的热膨胀系数;采用5组不同载荷水平的相变确定了相变塑性系数,依次得到了热处理模拟所需的参数。该研究有助于热处理数值模拟技术的进一步推广应用。
An experimental method was used to determine material simulation parameters for heat treatment.The strain decomposition can be used to divide thermo-mechanical cycling into no transformations,transformations but no stress,and transformations with stress based on a deformation behavior analysis of the uniform heat affected zone.The elastic strain,thermal strain,transformation strain and transformation plasticity strain were all obtained from the total strain.Then,the plastic modulus,the phase transformation expansion coefficient and the thermal and transformation kinetics parameters were also determined.These parameters were then determined experimentally for medium carbon low alloy steel for heat treatment simulations.The plasticity parameters for all three phases were obtained using tension tests at different temperatures.The parameters related to the phase transformation were then obtained by thermal cycling tests without an applied load.Finally,the transformation plasticity parameters were determined by five thermal cycling tests at different loads.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第7期989-994,共6页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金重点项目(50831008)
关键词
热处理
数值模拟
物理模拟
热力循环
相变塑性
heat treatment
numerical simulation
physical simulation
thermo-mechanical cycles
transformation induced plasticity
