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研究了加镁与不加镁的４Ｃｒ１２Ｎｉ８Ｍｎ８ＭｏＶＮｂ合金的微观组织特征，结果表明，用镁微合金化可净化、强化晶界，并可细化晶粒、消除晶界Ｍ２３Ｃ６薄片密集区及促进块状ＭＣ向颗粒状Ｍ２３Ｃ６退化，从而说明了适量镁对提高合金持久寿命的作用机理。
The microstructure of 4Cr12Ni8Mn8MoVNb alloy with or without magnesium was studied. The results show that the microstructure of 4Cr12Ni8Mn8MoVNb alloy can be purified and strengthened by magnesium microalloying, and the grain boundary can be refined, the dense area of grain boundary M23C6 can be eliminated, and the massive MC Degradation to the granular M23C6, indicating that the amount of magnesium to improve the long-life alloy mechanism.