低硅TRIP钢的力学性能及残余奥氏体稳定性研究

材料工程, 2010, (4): 72-80. doi: 10.3969/j.issn.1001-4381.2010.04.017

低硅TRIP钢的力学性能及残余奥氏体稳定性研究

定巍 ^1, , 江海涛 ^2, , 唐荻 ^3, , 田志强 ^4, , 殷安民 ^5,

1.北京科技大学,高效轧制国家工程研究中心,北京,100083

2.北京科技大学,高效轧制国家工程研究中心,北京,100083

3.北京科技大学,高效轧制国家工程研究中心,北京,100083

4.北京科技大学,高效轧制国家工程研究中心,北京,100083

5.北京科技大学,高效轧制国家工程研究中心,北京,100083

基金项目: 国家自然科学基金资助项目(50804005) 北京市科技计划资助项目(D07010300700000)

关键词：低硅TRIP钢 , 力学性能 , 加工硬化 , 残余奥氏体

Mechanical Property and Retained Austenite of Low-Si TRIP Steel

Keywords： low-Si TRIP steel , mechanical property , work-hardening , retained austenite

通过常温拉伸实验研究低SiTRIP钢的力学性能及其加工硬化特点,利用扫描电镜(SEM)、X射线衍射(XRD)、电子背散射衍射(EBSD)、透射电镜(TEM)等手段研究低SiTRIP钢在拉伸变形前后组织变化特别是残余奥氏体特性的变化.结果表明:低SiTRIP钢表现出良好的力学特性,没有屈服平台,低的屈强比,同时又拥有比双相钢更好的延伸率和均匀应变.TRIP钢的残余奥氏体的分布也影响着其稳定性,分布在铁素体晶内的残余奥氏体在拉伸变形后仍然存在.

The mechanical properties and work-hardening characteristics of A low-Si TRIP steel were researched by the tensile test.The change of structure before and after tensile test, especially the change of retained austenite, were studied with scanning electron microscope (SEM), X-ray diffraction (XRD), electron back-scattered diffraction (EBSD) and transmission electron microscope (TEM).The results show that the low-Si TRIP steel has good mechanical properties, no yield point and possess of low yield ratio, meantime it has better extensibility and homogeneous strain than DP steel.Retained austenite distribution also affects the stability of the low-Si TRIP steel, retained austenite in ferrite grain still exists after the tensile test.

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