ML45CrMo钢16.8级螺栓的等温淬火工艺  

Austempering of ML45CrMo steel for grade 16.8 bolt

作　　者：唐建良 蒋杨英 闫洪军[1] Tang Jianliang;Jiang Yangying;Yan Hongjun(Zhoushan 7412 Factory,Zhoushan Zhejiang 316041,China)

机构地区：[1]舟山市7412工厂,浙江舟山316041

出　　处：《金属热处理》2024年第5期231-233,共3页Heat Treatment of Metals

摘　　要：采用国产ML45CrMo钢进行等温淬火处理试验。试样在SY805-5网带炉中加热保温,然后放入硝盐等温槽中等温淬火,通过维氏硬度计、万能试验机、金相显微镜等手段对等温淬火试样的力学性能和显微组织进行了测试及观察。结果表明,ML45CrMo钢通过贝氏体等温淬火工艺:淬火加热温度850℃,保温80 min,在硝盐中等温淬火,硝盐温度(320±10)℃,等温时间60 min,达到了16.8级螺栓的性能要求。Domestic ML45CrMo steel was conducted austempering treatment tests.The specimens were heated and held in a SY805-5 mesh belt furnace,and then placed in a nitrate salt bath for austempering.The mechanical properties and microstructure of the austempered specimens were tested and observed by means of Vickers hardness tester,universal testing machine and metallographic microscope.The results show that after bainitic austempering,i.e.quenching at 850℃for 80 min,austempering in nitrate at temperature of(320±10)℃,holding for 60 min in nitrate,the ML45CrMo steel meets the property requirements of grade 16.8 bolts.

关 键 词：ML45CrMo钢 贝氏体等温淬火 16.8级螺栓 

分 类 号：TG156.3[金属学及工艺—热处理]