循环加载条件下TRIP型双相不锈钢的相变启动预测模型  

Prediction Model for Phase Transformation Initiation of TRIP Type Duplex Stainless Steel under Cyclic Loading

作　　者：邹宗园[1] 宋宇 王宏中 刘冠男 陈雷[3] 金淼[1] ZOU Zongyuan;SONG Yu;WANG Hongzhong;LIU Guannan;CHEN Lei;JIN Miao(Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education,Yanshan University,Qinghuangdao 066004;NORINCO Jiangshan Heavy Industries Research Institute Co.,Ltd.,Xiangyang 441000;School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004)

机构地区：[1]燕山大学先进锻压成形技术与科学教育部重点实验室,秦皇岛066004 [2]中国兵器集团江山重工研究院有限公司,襄阳441000 [3]燕山大学机械工程学院,秦皇岛066004

出　　处：《机械工程学报》2024年第14期166-173,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金(52375388,51905467);河北省自然科学基金(E2020203104)资助项目。

摘　　要：应变诱导马氏体相变对TRIP型双相不锈钢的循环力学性能有重要影响,明确循环加载条件下的马氏体相变启动规律,是进一步开发和应用高性能TRIP型双相不锈钢的基础。TRIP型双相不锈钢在单调加载条件下的相变规律已较为清晰,而循环加载条件下的相变规律还需要进一步深入研究。从相变热力学和塑性变形能的角度,分别计算TRIP型双相不锈钢的相变化学驱动功和相变机械驱动功。根据热力学第一定律,构建循环加载条件下马氏体相变启动周次预测模型。利用铁素体测量仪(FISHERFMP30)和液压伺服疲劳试验机(INSTRON8801)搭建试验平台,进行应变幅为0.5%、0.7%、0.9%和1.3%的马氏体相变原位测量试验。分析马氏体转变量随循环周次的变化规律,确定相变启动周次,拟合求解相变启动周次预测模型参数。通过应变幅1.1%下的EBSD、TEM微观组织观测试验,分析马氏体相变启动特点,验证所建立的循环相变启动周次预测模型。研究结果可为循环加载条件下的马氏体相变研究提供理论参考,从而为高性能TRIP钢的进一步开发及应用提供理论支撑。Strain induced martensitic transformation has an important effect on the cyclic properties of TRIP type duplex stainless steel,and the clarification of the martensitic transformation initiation law is the basis for further development and application of high-performance TRIP type duplex stainless steels.The martensitic transformation law of TRIP type duplex stainless steel under monotonic loading has been relatively clear,but the law under cyclic loading condition needs further study.From the perspectives of phase transformation thermodynamics and plastic deformation energy,calculate the chemical driving force and mechanical driving force of phase transformation for TRIP type duplex stainless steel.Based on the first law of thermodynamics,a prediction model of martensitic transformation initiation cycles is established under the cyclic loading.In-situ tests of martensitic transformation with strain amplitudes of 0.5%,0.7%,0.9%and 1.3%are carried out by using Ferrite Measuring Instrument(FISHER FMP30)and hydraulic servo fatigue testing machine(INSTRON 8801).Analyze the variation law of the martensitic transformation amount with the change of cycles,determine the transformation initiation cycle,and solve the parameters of the transformation initiation cycle prediction model.Finally,EBSD and TEM microstructure observation experiments under the characteristic cycles with strain amplitude of 1.1%are carried out to study the initiation characteristics of martensitic transformation and verify the established prediction model of cyclic transformation initiation.The results can provide a theoretical reference for the study of martensitic transformation under cyclic loading conditions,and provide theoretical support for the further development and application of high-performance TRIP steels.

关 键 词：TRIP效应 循环加载 马氏体相变 相变启动 应变幅 

分 类 号：TG156[金属学及工艺—热处理]