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通过测定连续冷却相变(CCT)曲线和观察显微组织,研究了不同稀土含量对20Mn钢相交和组织的影响。稀土扩大了CCT图上铁素体和贝氏体转变区域,缩小珠光体转变区域。稀土使马氏体条束变小变窄,有利于形成粒状贝氏体和块状铁索体。稀土通过细化臭氏体晶粒、减少臭氏体中碳固溶量和抑制碳化物析出,使20Mn钢的淬透性交差并使相交产物发生变化。
The effect of different RE content on the intersection and microstructure of 20Mn steel was studied by measuring the continuous cooling transformation (CCT) curve and observing the microstructure. Rare earths expand the areas of ferrite and bainite transformation on the CCT diagram and reduce the pearlite transformation area. Rare earth make martensite bundles smaller and narrower, is conducive to the formation of granular bainite and massive ferrite body. Rare earths through the refinement of the fossil grain, reduce the amount of carbon in the solid solution and inhibit the precipitation of carbides, 20Mn steel cross-hardenability and the intersection of cross-product changes.