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作 者:姜云[1,2,3] 梁益龙[3,4] 徐军[3,4] 雷磊[3,4] 欧梅桂[3,4]
机构地区:[1]贵州大学机械工程学院,贵州贵阳550025 [2]贵州大学现代制造技术教育部重点实验室,贵州贵阳550025 [3]贵州大学贵州省材料结构与强度重点实验室,贵州贵阳550025 [4]贵州大学高性能金属结构材料与制造技术国家地方联合工程实验室,贵州贵阳550025
出 处:《中南大学学报(自然科学版)》2017年第3期617-624,共8页Journal of Central South University:Science and Technology
基 金:国家自然科学基金资助项目(51461006);贵州省工业攻关项目(GZ(2014)3018);贵州省科技合作计划项目(LH(2015)7646)~~
摘 要:采用DIL805A相变仪结合光学显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)研究不同淬火速度对60Si2CrVAT弹簧钢显微组织、力学性能和马氏体转变点的影响。研究结果表明:在淬火速度从10℃/s增加800℃/s的过程中,随淬火速率的增加,马氏体块的宽度从666.0 nm减小至573.9 nm,马氏体板条的宽度从189.0 nm减少到147.3 nm。60Si2CrVAT弹簧钢的强度、塑性和硬度总体呈现先增加后降低的趋势,马氏体转变温度则呈先下降后增加的趋势,当冷速为200℃/s时,马氏体转变开始点温度最低而强度和塑性均达到最大,分别为1 924 MPa和26.4%,综合力学性能最好。淬火过程中产生的微纳米孪晶马氏体对提高材料的强塑性起到了促进作用。The influences of different quenching rates on microstructure, mechanical properties and martensite start transformation temperature(Ms) of 60Si2CrVAT spring steel were performed by DIL805 A transformation instrument with optical microscope(OM), scanning electron microscope(SEM) and transmission electron microscope(TEM). The results show that the width of martensite blocks decreases from 666.0 nm to 573.9 nm and that of lathes decreases from 189.0 nm to 147.3 nm with the increase of quenching rate from 10 ℃/s to 800 ℃/s. With the increase of quenching rate, the strength, plasticity and hardness of the tested 60Si2CrVAT steel increase to a peak at around 200 ℃/s. The martenitic transformation point shows the opposite characteristics. At the quenching rate of 200 ℃/s, the martensitic transformation point is the lowest and the tested steel has the best comprehensive properties in which the tensile strength reaches 1 924 MPa and the reduction of area comes to 26.4%. Micro-nano-scale twin martensite appears during quenching process which plays a significant role in improving mechanical properties.
分 类 号:TG142[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]
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