Continuous Cooling Transformation Behaviour of U75V Steel
摘 要
利用膨胀法结合金相分析在热模拟试验机上测定了U75V钢不同冷却速率下的连续冷却转变膨胀曲线,获得了该钢的连续冷却转变曲线(CCT曲线);研究了冷却速率对钢组织及硬度的影响.结果表明:当冷速小于10 ℃·s-1时,转变产物主要以珠光体为主;当冷速增大到10 ℃·s-1时,得到屈氏体组织和马氏体组织;当冷速增大到10 ℃·s-1以上时,得到马氏体组织;试验钢的硬度随冷却速率的增加而增大.
Abstract
By dilatometric test,microstructure analysis and hardness measurement,the expansion curves of continuous cooling transformation at different cooling rates were determined for U75V rail steel using a hot simulation testing machine,and the continuous cooling transformation curve was obtained.The influence of cooling rate on microstructure and hardness was studied.The results show that the product of austenitie transformation was pearlite when the cooling rate was lower than 10 ℃·s-1.Troostite and martensite were obtained at the cooling rate of 10 ℃·s-1.Only martensite was got if the cooling rate was in the range of 10-50 ℃·s-1.The hardness of the steel increased with the increase of cooling rate.
中图分类号 TB302.3
所属栏目 试验研究
基金项目 武汉市科技计划资助项目(20061002085)
收稿日期 2007/8/24
修改稿日期 2007/10/19
网络出版日期
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备注任安超(1976-),男,河南新乡人,工程师,硕士研究生.
引用该论文: REN An-chao,JI Yu,ZHAO Long-qi,SONG Xin-li,SHEN Dong-dong,YUAN Ze-xi. Continuous Cooling Transformation Behaviour of U75V Steel[J]. Materials for mechancial engineering, 2008, 32(7): 15~17
任安超,吉玉,赵隆崎,宋新丽,沈冬冬,袁泽喜. U75V钢的连续冷却相变行为[J]. 机械工程材料, 2008, 32(7): 15~17
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参考文献
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