等温淬火与回火工艺对Cr-Ni-Mo-V合金钢组织性能的影响
Effects of austempering and tempering process on microstructure and mechanical properties of Cr-Ni-Mo-V alloy steel
于贵宁 1田泽 1王暄儒 1闫素嘉 1周琮 1曹铁山 1戚琳1
作者信息
- 1. 大连理工大学材料科学与工程学院,辽宁大连 116024
- 折叠
摘要
研究了等温淬火形成的贝氏体/马氏体双相组织Cr-Ni-Mo-V合金钢在回火过程中组织和力学性能的变化.以等温淬火温度、等温淬火时间、回火温度为因素设计了正交试验方案,利用冲击试验机结合维氏硬度计探究了等温淬火与回火工艺对Cr-Ni-Mo-V超高强韧钢力学性能的影响,并通过扫描电镜、金相显微镜对材料显微组织变化进行分析.结果表明,等温淬火温度与回火温度均对材料力学性能有显著影响,其中回火温度的影响更大.回火过程中贝氏体向回火托氏体转变,M/A岛逐渐分解,320℃等温淬火12 h+560 ℃回火试样表现为冲击性能最优,280℃等温淬火50 min+不回火试样表现为硬度最高,并得出最佳热处理工艺参数为880 ℃奥氏体化1 h+280℃等温淬火12 h+560℃回火,冲击吸收能量为60.0 J,硬度为518.7 HV2.
Abstract
Microstructure and mechanical properties of Cr-Ni-Mo-V alloy steel with bainite/martensite duplex structure formed by austempering during tempering were investigated.The orthogonal experiment scheme was designed with austempering temperature,austempering time and tempering temperature as factors.The effects of austempering and tempering process on the mechanical properties of the Cr-Ni-Mo-V ultra-high strength and toughness steel were explored by means of the impact testing machine combined with Vickers hardness tester,and the microstructure changes of the material were analyzed by scanning electron microscope and metallographic microscope.The results indicate that both the austempering temperature and tempering time have a significant effect on the microstructure and mechanical properties of the material,with the tempering time having a greater impact.During the tempering process,bainite transforms to tempered troostite and M/A islands gradually decompose.After austempering at 280 ℃ for 12 h and tempering at 560 ℃,the specimen shows the best impact property.After austempering at 280 ℃ for 50 min and non-tempering,the specimen shows the highest hardness,and the best heat treatment parameters are obtained after austempering at 280 ℃ for 12 h and tempering at 560 ℃,with impact absorbed energy of 60.0 J and the hardness of 518.7 HV2.
关键词
Cr-Ni-Mo-V合金钢/双相组织/热处理/等温淬火Key words
Cr-Ni-Mo-V alloy steel/duplex structure/heat treatment/austempering引用本文复制引用
出版年
2024
NETL
NSTL
万方数据