摘要
研究了不同奥氏体化温度下V微合金中碳钢(40CrNiMoV钢)的淬透性,利用控制冷却技术对不同温度奥氏体化后的试验钢进行慢冷处理,并对慢冷组织以及回火处理后的力学性能进行分析。结果表明:随奥氏体化温度的升高,在原奥氏体晶粒尺寸和固溶V含量的共同作用下,试验钢的淬透性增大。在800~1000℃范围控制冷却时,获得的马氏体形态与奥氏体化温度有关;在淬透性和晶粒尺寸的共同影响下,试验钢的强度随温度的升高而急剧升高后基本保持稳定,冲击韧性随温度升高呈降低趋势。在奥氏体化温度为900℃时,试验钢慢冷并回火后获得最佳强塑性配合。
The hardenability of a vanadium microalloyed medium-carbon steel,namely 40CrNiMoV steel,at different austenitizing temperatures was studied.The test steel was heated to different austenitizing temperatures followed by slow cooling process.The microstructure after slow cooling process and tempered mechanical properties were analyzed.Results showed that the hardenability increased with increasing austenitizing temperature.When the austenitizing temperature was in the range of 800~1 000 ℃,the martensite morphology changed with temperature. With the combination effect of hardenability and grain size,the strength of the test steel increased sharply with the increase of temperature first and then maintained a similar level,while the impact toughness decreased monotonically with the increase of temperature.An optimum combination of strength and ductility was obtained at 900 ℃.
作者
孙东云
陈晨
张福成
杨志南
秦羽满
SUN Dongyun;CHEN Chen;ZHANG Fucheng;YANG Zhinan;QIN Yuman(State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao,Hebei 066004,China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao,Hebei 066004,China)
出处
《燕山大学学报》
CAS
北大核心
2019年第3期189-198,共10页
Journal of Yanshan University
基金
国家自然科学基金资助项目(51831008)
国家重点研发计划资助项目(2017YFB0304501)
关键词
V微合金钢
奥氏体化温度
淬透性
组织
力学性能
vanadium microalloyed steel
austenitizing temperature
hardenability
microstructure
mechanical properties
