晶粒尺寸对低层错能Fe-Mn-Si-Al奥氏体合金钢准静态力学性能的影响  

Effect of Grain Size on Quasi-static Mechanical Properties of Low Stacking Fault Energy Fe-Mn-Si-Al Austenitic Alloy Steel

作　　者：刘文金 杨蔚涛 杨旗 詹科[1] LIU Wenjin;YANG Weitao;YANG Qi;ZHAN Ke(School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Engineering Materials Application and Evaluation,Shanghai Research Institute of Materials,Shanghai 200437,China)

机构地区：[1]上海理工大学材料科学与工程学院,上海200093 [2]上海材料研究所,上海市工程材料应用与评价重点实验室,上海200437

出　　处：《机械工程材料》2020年第8期10-16,共7页Materials For Mechanical Engineering

基　　金：上海市虹口区商务委重点项目(ZDXM-2019-001)。

摘　　要：在不同温度(700,730,800,900,1000,1100,1200℃)下对低层错能Fe-29.8Mn-5.0Si-1.7Al合金钢冷轧板进行退火处理,研究了原始奥氏体晶粒尺寸对其准静态力学性能和变形过程中相变行为的影响规律。结果表明:随退火温度(高于730℃)升高,合金钢发生明显静态再结晶,晶粒尺寸增加,组织均为单一奥氏体;再结晶退火合金钢在拉伸变形过程中均发生ε马氏体相变,细晶(奥氏体晶粒尺寸小于21μm)有助于合金钢获得高屈服强度和高抗拉强度,粗晶(奥氏体晶粒尺寸大于90μm)内部形成了均匀分布且相互交截的多变体ε马氏体,有利于提高其塑性。The cold rolled Fe-29.8Mn-5.0Si-1.7Al austenitic steel with low stacking fault energy was annealed at different temperatures(700,730,800,900,1000,1100,1200℃).The influence of original austenite grain size on quasic-static mechanical properties and phase transformation behavior during deformation of the steel was studied.With the annealing temperature(above 730℃)increasing,obvious static recrystallization occurred on the alloy steel,the grain size increased,and the microstructure was single austenite.Recrystallized annealed alloy steel underwentε-martensitic transformation during tensile deformation,the fine-grained structure(austenite grain size was less than 21μm)was conducive to the alloy steel to obtain high yield strength and high tensile strength,and the coarse-grained structure(austenite grain size was greater than 90μm)was beneficial to improve the plasticity,because of evenly distributed and intersecting multiple variantsε-martensite formed in coarse austenite grains.

关 键 词：低层错能 Fe-Mn-Si-Al合金 形变诱发ε马氏体相变 晶粒尺寸 准静态力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]