热轧变形对Fe-14Cr-3W-0.4Ti合金显微组织和力学性能的影响  

Effect of hot rolled deformation on microstructure and mechanical properties of Fe-14Cr-3W-0.4Ti alloy

作　　者：卢思哲 刘祖铭[1] 李全 任亚科 魏冰 彭伟才 LU Sizhe;LIU Zuming;LI Quan;REN Yake;WEI Bing;PENG Weicai(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Changsha Mitr Instrument Equipment Co.Ltd.,Changsha 410219,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]长沙米淇仪器设备有限公司,长沙410219

出　　处：《粉末冶金材料科学与工程》2021年第6期567-574,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：中国工程院重点项目(2019-XZ-11);国家地方联合工程研究中心开放基金资助项目(HKDNM201907);粉末冶金国家重点实验室自主课题;中南大学中央高校基本科研业务费专项资金资助项目(2020ZZTS453)。

摘　　要：对氩气雾化Fe-14Cr-3W-0.4Ti(质量分数,%)合金粉末进行60 h机械球磨,在950℃对粉末进行热挤压成形,然后在950℃热轧制和1050℃/1 h退火热处理,得到Fe-14Cr-3W-0.4Ti合金。利用扫描电镜和背散射电子衍射分析仪观察和分析合金的显微组织,并测定合金的室温拉伸性能,研究热轧变形对Fe-14Cr-3W-0.4Ti合金组织与力学性能的影响。结果表明,热轧变形可有效调控Fe-14Cr-3W-0.4Ti合金的晶粒尺寸,提高合金的力学性能。经过热轧变形的合金,晶粒明显细化,并且随热轧制变形量增加,晶粒尺寸先减小后增大,合金的抗拉强度也出现先升高后降低现象。合金的最佳热轧参数为950℃/40%,变形量为40%的合金平均晶粒尺寸最小,为1.39μm,抗拉强度和伸长率分别达到1161 MPa和9.5%,与挤压成形态合金相比,抗拉强度提高31.2%。The atomized Fe-14Cr-3W-0.4Ti(mass fraction,%)alloy powder was subjected to mechanical ball milling for 60 h,hot extrusion forming at 950℃,hot rolling at 950℃and annealing at 1050℃/1 h to obtain Fe-14Cr-3W-0.4Ti alloy.The effects of hot rolling deformation on the microstructure and mechanical properties of Fe-14Cr-3W-0.4Ti alloy were studied by Scanning Electron Microscopy(SEM)and Electron Backscattering Diffraction(EBSD)analysis.The results show that hot rolling deformation can effectively control the grain size of Fe-14Cr-3W-0.4Ti alloy and improve the mechanical properties of the alloy.After hot rolling,the grain size of the extruded alloy is obviously refined,the grain size decreases first and then increases,and the tensile strength of the alloy also increases first and then decreases with the increase of hot rolling deformation,and the optimum hot rolling parameters of the alloy are 950℃/40%.After hot rolling at 950℃/40%deformation,the average grain size of the alloy is the smallest and for 1.39μm,and the tensile strength and elongation of the alloy reach 1161 MPa and 9.5%,respectively.The tensile strength is increased by 31.2%compared with that of the extruded alloy.

关 键 词：Fe-14Cr-3W-0.4Ti合金 热轧变形 显微组织 力学性能 细晶强化 

分 类 号：TG141[一般工业技术—材料科学与工程] TF124[金属学及工艺—金属材料]