68CrNiMo钢锯链切齿片的等温淬火工艺  

Austempering process of 68CrNiMo steel hacksaw chain cutters

作　　者：李存志 代玉杰 Li Cunzhi;Dai Yujie(Qingdao Choho Industrial Co.,Ltd.,Qingdao Shandong 266705,China;Qingdao Gold Chain Detection Technology Service Co.,Ltd.,Qingdao Shandong 266705,China)

机构地区：[1]青岛征和工业股份有限公司,山东青岛266705 [2]青岛金链检测技术服务有限公司,山东青岛266705

出　　处：《金属热处理》2024年第5期220-225,共6页Heat Treatment of Metals

摘　　要：利用JmatPro金属材料模拟软件对68CrNiMo钢锯链切齿片的等温淬火工艺进行了研究。通过JmatPro软件模拟获得了68CrNiMo钢的相变温度,其平衡状态下奥氏体临界转变温度Ac1为726.5℃、Ac3为746.9℃。68CrNiMo钢的等温淬火工艺设计为,淬火温度840℃,加热保温时间为40 min,保温后由落料口直接落到等温盐槽中进行等温,等温温度为285~300℃,等温时间为35 min,空冷后进行180℃×60 min回火处理。结果表明,等温淬火+回火处理后68CrNiMo钢组织由下贝氏体、回火马氏体和残留奥氏体组成,硬度在54~56 HRC区间,硬度比较均匀,折弯90°未发生断裂,其组织性能均满足锯链要求。Austempering process of the 68CrNiMo steel hacksaw chain cutters was studied by using metal material simulation software JmatPro.The phase transformation temperatures of the 68CrNiMo steel are obtained through JmatPro simulation,and the critical austenite transformation temperature Ac1 and Ac3 in equilibrium state are 726.5℃and 746.9℃,respectively.The austempering process of 68CrNiMo steel is proposed as follows:heating at 840℃for 40 min,then directly falling into the isothermal salt tank from the discharge port for isothermal treatment,holding at 285-300℃for 35 min,air cooling followed by 180℃×60 min tempering.The results show that,after the proposed austempering+tempering,the microstructure of the 68CrNiMo steel is composed of lower bainite,tempered martensite and retained austenite,the hardness is in the range of 54-56 HRC and relatively uniform,and there is no fracture when the cutter is bended for 90°,where the microstructure and properties meet the requirements of hacksaw chain.

关 键 词：JmatPro软件 68CrNiMo钢 等温淬火 锯链 

分 类 号：TG156.3[金属学及工艺—热处理]