等温淬火对高钒耐磨合金组织与力学性能的影响  

Effect of austempering on microstructure and mechanical properties of high vanadium wear⁃resistant alloy

作　　者：谢红申 李明[1] 冷婉晴 刁晓刚 李洲[2] 徐流杰[2] Xie Hongshen;Li Ming;Leng Wanqing;Diao Xiaogang;Li Zhou;Xu Liujie(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Pangang Group Research Institute Co.,Ltd.,Panzhihua Sichuan,617000,China;National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials,Henan University of Science and Technology,Luoyang Henan 471003,China;Citic Luoyang Heavy Iron-Castings Co.,Ltd.,Luoyang Henan 471039,China)

机构地区：[1]攀钢集团研究院有限公司钒钛资源综合利用国家重点实验室,四川攀枝花617000 [2]河南科技大学金属材料磨损控制与成型技术国家地方联合工程研究中心,河南洛阳471003 [3]中信重工洛阳重铸铁业有限责任公司,河南洛阳471039

出　　处：《金属热处理》2024年第4期123-131,共9页Heat Treatment of Metals

基　　金：国家自然科学基金(U23A20628);钒钛资源综合利用国家重点实验室开放基金(2022P4FZG05A)。

摘　　要：采用砂型铸造工艺制备了高钒耐磨合金,研究了不同等温淬火温度对高钒耐磨合金组织与力学性能的影响。结果表明,经过200~300℃等温淬火处理后,可得到由贝氏体铁素体板条与薄膜/块状残留奥氏体组成的纳米贝氏体基体组织,碳化物无明显变化,硬度和冲击吸收能量较铸态合金显著提升。降低等温淬火温度对奥氏体向贝氏体的转变有促进作用,并对贝氏体组织产生明显的细化作用。随着等温温度由300℃降低到200℃,贝氏体铁素体条与片状奥氏体膜的厚度分别由50~200 nm和35~185 nm降低到20~100 nm和20~125 nm,合金的硬度由53.3 HRC升高59.3 HRC,冲击吸收能量轻微降低。与回火马氏体基体的合金相比,贝氏体基体合金的硬度降低,但合金的冲击性能显著提高。200℃等温淬火后,合金的硬度比回火马氏体基体合金降低1.7%,冲击吸收能量比回火马氏体基体合金提高60%。The effect of different austempering temperatures on the microstructure and mechanical properties of high vanadium wear⁃resistant alloy prepared by sand⁃casting was investigated.The results show that the alloy obtains nano⁃bainite matrix structure after austempering at 200⁃300℃,which is composed of bainite⁃ferrite lath and retained austenite in film/block form.The carbides exhibit no significant changes,whereas the hardness and impact absorbed energy significant improve compared to the as⁃cast alloy.Lowering the austempering temperature promotes the transformation of austenite to bainite and refines the bainite structure.As the austempering temperature decreases from 300℃to 200℃,the thickness of bainitic ferrite lath and austenite film decreases from 50⁃200 nm and 35⁃185 nm to 20⁃100 nm and 20⁃125 nm,respectively,and the alloy hardness increases from 53.3 HRC to 59.3 HRC,while the impact absorbed energy shows a slight decrease.In comparison to the alloy with a tempered martensite matrix,the bainite matrix alloy exhibits a lower hardness but a significantly improved impact absorbed energy.After austempering at 200℃,the alloy hardness is 1.7%lower than that of the tempered martensite matrix alloy,while its impact absorbed energy is 60%higher.

关 键 词：等温淬火 高钒耐磨合金 纳米贝氏体 力学性能 

分 类 号：TG113.1[金属学及工艺—物理冶金]