中文摘要：

对一种钒微合金化低碳中锰钢进行了轧制及热处理实验,对其组织与性能进行了研究,通过选取合理的热处理工艺,获得了良好的强韧性指标.结果表明：热轧态中锰钢的屈服强度在700MPa以上,-40℃的冲击功为67J,当淬火温度和回火温度分别为900℃和600℃时,实验钢的屈服强度在650 MPa以上,-40℃的冲击功为275J,具有良好的强韧性指标.热处理态实验钢的组织为回火马氏体,组织细化有利于提高实验钢的低温冲击功,当淬火温度为900℃时,在回火过程中可析出大量20nm以下的二元相VC,其析出强化量在150 MPa以上.

英文摘要：

Rolling and heat treatment experiments were carried out for a vanadium micro alloyed low carbon medium manganese steel and the microstructure and properties of steel were investigated.Good strength and toughness for the steel was obtained by selecting appropriated heat treatment process.The results show that the yield strength and impact energy at-40℃are 700 MPa and 67 J,respectively.The yield strength and impact energy at-40 ℃ are 650 MPa and 275 J,respectively,when the quenching temperature and tempering temperature are at 900 ℃ and 600 ℃respectively and good strength and toughness are obtained for the steel.Tempered martensite is obtained for the heat treatment steel,and the refined microstructure can improve the impact energy at low temperature for the heat treatment steel.A large number of VC precipitates are observed with size less than 20 nm dispersed in tempered steel when the quenching temperature is at 900 ℃,and the amount of the precipitation hardening is higher than 150 MPa.