含钴高钒高速钢回火组织演变和耐磨性  

Tempered microstructure evolution and wear resistance of cobalt-containing high vanadium high speed steel

作　　者：牛海云[1] 潘泳良 金头男[2] 袁乃博 符寒光[2] NIU Hai-yun;PAN Yong-liang;JIN Tou-nan;YUAN Nai-bo;FU Han-guang(School of Materials Engineering,Jiyuan Vocational and Technical College,Jiyuan 459000,China;Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;Xingtai Delong Machinery Roll Co Ltd,Xingtai 054009,China)

机构地区：[1]济源职业技术学院材料工程学院,河南济源459000 [2]北京工业大学材料与制造学部,北京100124 [3]邢台德龙机械轧辊有限公司,河北邢台054009

出　　处：《材料热处理学报》2023年第8期123-132,共10页Transactions of Materials and Heat Treatment

基　　金：河北省重大科技成果转化专项(21281003Z)。

摘　　要：采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)、能谱仪(EDS)、显微硬度计和磨损试验机等研究了含钴高钒高速钢经1050℃风冷淬火后在不同温度回火保温不同时间后的组织演变、硬度和耐磨性。结果表明:在不同回火温度下,含钴高钒高速钢中均有MC和M_(2)C型二次碳化物析出,并在基体中均匀分布。当回火温度为400℃时,含钴高钒高速钢中含有少量残留奥氏体;当回火温度超过500℃,残留奥氏体消失;随着回火温度升高,马氏体发生分解,600℃回火后,孪晶马氏体已完全分解。含钴高钒高速钢经500℃回火后硬度达到峰值,磨损量最小,耐磨性最好,回火温度继续升高后,硬度大幅度下降。在500℃回火时,随着保温时间的延长,含钴高钒高速钢的马氏体分解量增加,保温16 h后,马氏体已完全分解,基体显微硬度明显下降,由于二次碳化物析出的强化效应,导致回火保温时间增加对其宏观硬度无明显影响。Microstructure evolution,hardness and wear resistance of cobalt-containing high vanadium high speed steel after quenching at 1050℃by air cooling and tempering at different temperatures for different time were studied by means of scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),energy dispersive spectrometer(EDS),microhardness tester and wear tester.The results show that the MC and M_(2)C type secondary carbides precipitate in the cobalt-containing high vanadium high speed steel after tempering at different temperatures,and are uniformly distributed in the matrix.When the tempering temperature is 400℃,there is a small amount of retained austenite in the cobalt-containing high vanadium high speed steel;when the tempering temperature exceeds 500℃,the retained austenite disappears.With the increase of tempering temperature,the martensite decomposes,after tempering at 600℃,the twin martensite has completely decomposed.After tempering at 500℃,the hardness of the cobaltcontaining high vanadium high speed steel reaches the peak value,the wear amount is the smallest,and the wear resistance is the best.With the increase of tempering temperature,the hardness decreases significantly.When tempering at 500℃,with the increase of holding time,the amount of martensite decomposition of the cobalt-containing high-vanadium high-speed steel increases,after holding for 16 h,the martensite has been completely decomposed,and the microhardness of the matrix decreases significantly.Due to the strengthening effect of secondary carbide precipitation,the increase of tempering holding time has no obvious effect on its macro-hardness.

关 键 词：含钴高钒高速钢 回火处理 组织演变 二次碳化物 力学性能 

分 类 号：TG142.4[一般工业技术—材料科学与工程]