SPS制备ODS铁基合金的显微组织与力学性能  

Microstructure and mechanical properties of oxide dispersion strengthened Fe-based alloy prepared by spark plasma sintering

作　　者：段清龙 刘祖铭[1] 黄立清[1] 郭旸[1] 苏鹏飞[1] 陈仕奇[1] DUAN Qinglong;LIU Zuming;HUANG Liqing;GUO Yang;SU Pengfei;CHEN Shiqi(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金国家重点实验室

出　　处：《粉末冶金材料科学与工程》2020年第1期72-78,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家高技术研究发展计划(863计划)资助项目(2009AA032526);国家自然科学基金资助项目(50634060);中南大学粉末冶金国家重点实验室资助项目

摘　　要：对空气气氛下球磨制备的含氧预合金铁基粉末,在900~1100℃进行放电等离子烧结(spark plasma sintering,SPS)制备氧化物弥散强化(oxide dispersion strengthened,ODS)铁基合金,并进行变形量为50%的热轧和1000℃/1 h退火热处理。采用X射线衍射仪、光学显微镜、扫描电镜、透射电镜以及拉伸试验等对ODS铁基合金显微组织与力学性能进行表征。结果表明:烧结温度、热轧及热处理对ODS铁基合金的显微组织和性能具有重要影响。随烧结温度升高,原始颗粒界面逐步消除,合金孔隙减小,致密度提高,抗拉强度和显微硬度提高,在900,1000和1100℃烧结的合金抗拉强度分别为191,392和814 MPa;900℃烧结的合金经轧制与热处理后,抗拉强度和塑性提高;1100℃烧结的合金经过轧制后,抗拉强度提高到1003 MPa,伸长率为6.48%,进一步热处理后,抗拉强度及伸长率分别为915 MPa和9.77%。Oxide dispersion strengthened(ODS)steels was fabricated by gas atomized and ball milling powders via spark plasma sintering(SPS)at 900−1100℃,hot rolling and annealing.Microstructure and mechanical properties of these alloys were investigated by means of X-ray diffraction(XRD),metallographic analysis(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and mechanical testing such as micro-hardness and tensile testing.The results show that sintering temperature,hot rolling and heat treatment can greatly affect the microstructure and properties of ODS iron-based alloys.With the increase of sintering temperature,the original particle interface is gradually eliminated,the porosity of the alloy decreased,the density is increased,the tensile strength and microhardness increase.The tensile strength of the alloys sintered at 900,1000 and 1100℃are 191,392 and 814 MPa respectively.After rolling and annealing,the tensile strength and elongation of steel sintered at 900℃increase.After rolling,the tensile strength of the alloy sintered at 1100℃increases to 1003 MPa,and the elongation is 6.48%.After heat treatment,the tensile strength decreases to 915 MPa,and the total elongation increases to 9.77%.

关 键 词：放电等离子体烧结 热轧制 热处理 铁基合金 纳米氧化物 

分 类 号：TF125.13[冶金工程—粉末冶金]