回火温度对高速重载列车车轴用钢EA4T冲击韧度的影响  

Influence of Tempering Temperature on Impact Toughness of Axle Steel EA4T in High-speed Overloaded Trains

作　　者：康利梅[1] 雷旻[1,2] 邹静[1] 梁益龙[1,2] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550003 [2]贵州省材料结构与强度重点实验室,贵州贵阳550003

出　　处：《铸造技术》2012年第3期302-303,共2页Foundry Technology

基　　金：科技部<科技人员服务企业行动项目>资助项目(2009GJF20026)

摘　　要：将经过不同温度回火后的EA4T钢试样分别加工成夏比V型和U型缺口冲击试样,通过系列冲击试验对EA4T钢的回火脆性进行了研究。结果表明,EA4T钢冲击韧度随回火温度的升高而升高,在550℃左右回火具有高温回火脆性,在高于回火脆性温度区回火时,其冲击韧度将大幅度提高。回火脆性对夏比V尖锐缺口的敏感性更高。Preparing Charpy V and U type impact samples of steel EA4T tempered at different temperature, respectively, the temper brittleness of steel EA4T was researched by a series of impact test on above samples. The results show that, with the increase of tempering temperature, impact toughness of steel EA4T rises, and there is high-temperature tempering brittleness at about 550 ℃. When the tempering temperature is higher than the region of temperature, the impact toughness value will improve greatly. Also found Charpy V type samples have higher sensitivity than U type impact samples for tempering brittleness.

关 键 词：EA4T钢 回火脆性 冲击韧度 

分 类 号：TG156.5[金属学及工艺—热处理]