回火温度对ZG0Cr13Mn8N钢显微组织的影响

Effect of Tempering Temperature on Microstructure of Steel ZG0Cr13Mn8N

研究了铬锰氮双相（ 马氏体奥氏体）ＺＧ０Ｃｒ１３Ｍｎ８Ｎ 钢在４００ ～７００ ℃温度区间内回火后的显微组织。结果表明，ＺＧ０Ｃｒ１３Ｍｎ８Ｎ 钢在５８０ ℃回火时奥氏体量增多；淬火和逆变奥氏体在低于５８０ ℃回火时都十分稳定，而高于５８０ ℃回火时则不稳定；随着回火温度的升高，马氏体板条特征愈加不明显，且在板条马氏体和奥氏体内均有Ｍ７Ｃ３ 型碳化物析出、聚集和长大。

The microstructure of a CrMnN dual phase(martensite austenite) steel tempered at temperature 400～700 ℃ was studied. The results show that the austenite content was maximum in the steel ZG0Cr13Mn8N tempered at 580℃. The quenching austenite and reversible transformation austenite were very stable in steel tempered at the temperature below 580℃, and were unstable in steel tempered at the temperature over 580℃. With increasing the tempering temperature and time, the M 7C 3 carbides precipitated, accumulated and grew up in martensitic lath and austenite, but with increasing tempering temperature the characteristic of the martensitic lath was not appreciable.