摘要
研究了以正火态粒状贝氏体为前组织的25Cr2MoV钢，经亚温正火后，显微组织与性能的变化。试验结果表明，以粒状贝氏体为主的正火态组织，韧性甚差（室温冲击值仅22J）；增加一道亚温正火工序后，在近乎等强度的条件下，可将其室温冲击值提高三倍以上，并使韧脆转变温度降低，而且韧化的效果在渗氮后依然能保持．对其韧化机理进行了探讨，认为组织的细化和马氏体岛含碳量的降低共同对提高钢材的韧性作出了贡献．
This paper deals with the micrcatructure and properties of intercritical normalind 25Cr2MoV steelcontaiuing granular bainite have been studied. It is shown that the granular bainte of 25Cr2MoV steel possess Poortougbness (The impact energy is only 22J at 20℃) and the intertritical nortnalizing steel can still keep the strenth levelwhile its v notch impact energy at 20℃ is enhanced over three times,and tbe ductile-brittle transition temperature islowered in addition the toughening effects can be remainded after nitriding. The mechanism of toughhess raising hasbeen diecussed in this paper,and it is considered that both the refining of microstracture,and the reduceing of carbonin martensite contributed to the toughnes of the steel.
出处
《热加工工艺》
CSCD
北大核心
1997年第5期19-21,共3页
Hot Working Technology
