不同温度下中锰TRIP钢循环变形及相变行为的实验研究  

Experimental Study on the Cyclic Deformation and Phase Transformation Behavior of Medium Manganese TRIP Steel at Different Temperature

作　　者：吴宗曦 程恋 张娟[1,2] WU Zong-xi;CHENG Lian;ZHANG Juan(School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan,China;Key Laboratory of Applied Mechanics and Structural Safety of Sichuan Province,Southwest Jiaotong University,Chengdu 611756,Sichuan,China)

机构地区：[1]西南交通大学力学与航空航天学院,四川成都611756 [2]西南交通大学应用力学与结构安全四川省重点实验室,四川成都611756

出　　处：《机械研究与应用》2025年第1期38-41,44,共5页Mechanical Research & Application

摘　　要：中锰钢作为第三代先进高强钢的典型代表,具有高强高韧的优异力学性能,且由于相变诱发塑性(TRIP)效应,其变形机理比其它钢材更为复杂。为保证构件的服役安全,中锰TRIP钢在高温和循环载荷下的变形特性以及变形机理亟待研究。文章在200℃和300℃下对Fe-0.35C-7Mn-3.2Al钢进行单轴循环加载实验,同时利用X射线衍射(XRD)对材料进行残余奥氏体(RA)体积分数测量,得到了不同温度下的RA含量变化。实验结果表明,材料在200℃下的循环软/硬化特征与室温相似,基本表现为循环稳定;而在300℃下则表现出明显的循环硬化。材料在非对称应力控制下的棘轮行为也表现出不同特征,在200℃下与常温表现相似,棘轮应变在循环过程中持续增长且不会饱和;而在300℃下棘轮应变会迅速达到饱和并发生安定现象。在200℃下的单轴拉伸以及循环变形过程中会发生明显的马氏体体相变,而在300℃下则几乎不发生马氏体相变。研究结果为后续中锰钢力学性能的温度相关性研究提供了参考和依据。Medium manganese steel,as a typical representative of the third-generation advanced high-strength steels,has excellent mechanical properties of high strength and toughness.Due to the transformation-induced plasticity(TRIP)effect,its deformation mechanism is more complex compared to other steels.To ensure the safety of service components,the deformation characteristics and mechanisms of medium manganese TRIP steel under high temperature and cyclic loading are urgently needed to study.The uniaxial cyclic experiments of Fe-0.35C-7Mn-3.2Al steel were conducted at temperatures of 200℃and 300℃respectively,and the X-ray diffraction(XRD)was used to measure the volume fraction of retained austenite(RA),revealing changes in RA content at different temperatures.The experimental results show that,at 200℃,the material′s cyclic softening/hardening characteristics are similar to those at room temperature,essentially showing cyclic stability;while at 300℃,it exhibits significant cyclic hardening.The ratcheting behavior of the material under asymmetric stressing also displays different characteristics.At 200℃,it is similar to that at room temperature,where the ratcheting strain continues to increase without saturation during cycling,but at 300℃,the ratcheting strain quickly reaches saturation and no longer increases.During the cyclic deformation process at 200℃,significant martensitic phase transformation occurs,while at 300℃,the martensitic transformation is almost absent.It provides a reference and basis for the subsequent study on the temperature-related mechanical properties of medium manganese steel.

关 键 词：中锰钢 循环变形 高温 相变 

分 类 号：TG142[一般工业技术—材料科学与工程]