时效处理对Fe-30.0Mn-9.6Al-1.0C低密度钢组织和性能的影响  

Effect of aging treatment on microstructure and properties of Fe-30.0Mn-9.6Al-1.0C low-density steel

作　　者：孙建 李景辉 黄贞益 章小峰 王东生 刘述庆 张龙 SUN Jian;LI Jinghui;HUANG Zhenyi;ZHANG Xiaofeng;WANG Dongsheng;LIU Shuqing;ZHANG Long(School of Mechanical Engineering,Tongling University,Tongling 244061,Anhui,China;School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243002,Anhui,China;Advanced Copper-based Material Industry Generic Technology Research Center of Anhui,Tongling 244061,Anhui,China)

机构地区：[1]铜陵学院机械工程学院,安徽铜陵244061 [2]安徽工业大学冶金工程学院,安徽马鞍山243002 [3]安徽省铜基新材料产业共性技术研究中心,安徽铜陵244061

出　　处：《材料工程》2024年第12期122-133,共12页Journal of Materials Engineering

基　　金：国家自然科学基金项目(51674004,51805002);安徽省高等学校自然科学研究重点项目(2022AH051760);铜陵学院人才科研启动基金项目(2024tlxyrc055);铜陵学院自然科学研究项目(2023tlxy05,2023tlxy03,2017tlxy23);工程液压机器人安徽普通高校重点实验室(铜陵学院)开放课题资助项目(TLXYCHR-O-21YB03)。

摘　　要：采用OM,SEM,XRD,EBSD和TEM等表征手段研究了时效处理对Fe-30.0Mn-9.6Al-1.0C低密度钢组织和性能的影响,并分析其应变硬化行为和强塑化机制。结果表明:经不同温度时效后,Fe-30.0Mn-9.6Al-1.0C低密度钢组织基本仍为全奥氏体并伴有κ-碳化物析出相的存在,时效温度升高,κ-碳化物析出量增大,对低密度钢强度有提升作用但会恶化低密度钢塑性,在1050℃固溶和450℃时效后,低密度钢抗拉强度为811 MPa,伸长率为106.9%,强塑积为86.7 GPa·%,500℃时效时,低密度钢抗拉强度为861 MPa,伸长率为33.2%,强塑积为28.6 GPa·%。低密度钢在1050℃固溶和不同温度时效拉伸变形后,其应变硬化指数呈现双n值现象,应变硬化行为呈多阶段变化规律。低密度钢拉伸变形后组织中存在着大量的位错墙、泰勒晶格和微带以及细小的κ-碳化物,其共同提高了低密度钢的强塑性。The effects of aging treatment on microstructure and properties of Fe-30.0Mn-9.6Al-1.0C lowdensity steel were studied by OM,SEM,XRD,EBSD,and TEM.The strain hardening behavior and strengthening plasticizing mechanism were also analyzed.The results show that after aging at different temperatures,the microstructure of Fe-30.0Mn-9.6Al-1.0C low-density steel remains mostly full austenite withκ-carbide precipitates.As the aging temperature increases,the increase inκ-carbide precipitation has an enhancing effect on the strength of the low-density steel,but it will deteriorate its plasticity.After solid solution at 1050℃and aging at 450℃,the tensile strength of the low-density steel is 811 MPa,the elongation is 106.9%,and the product of strength and plasticity is 86.7 GPa·%.When aging at 500℃,the tensile strength of the low-density steel is 861 MPa,the elongation is 33.2%,and the product of strength and plasticity is 28.6 GPa·%.After solid solution at 1050℃and aging tensile deformation at different temperatures,the strain hardening index of the low-density steel exhibits a double n-value phenomenon,and the strain hardening behavior shows a multi-stage variation pattern.After tensile deformation of the low-density steel,a large number of dislocation walls,Taylor lattice and microband structures,and fineκ-carbides together enhance the strength and plasticity of the low-density steel.

关 键 词：时效处理 低密度钢 微观组织 力学性能 强塑化机制 

分 类 号：TG142.1[一般工业技术—材料科学与工程]