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用端淬法研究了0.005wt%Ca 对42MnCr 钢淬透性及不同热处理状态下室温冲击韧性和显微组织的影响,用 Auger 能谱(AES)分析了沿晶断口表面 Ca 及其它元素的含量。结果表明,微 Ca 钢的淬透性稍高于无 Ca 钢;微 Ca 钢在所研究的热处理状态下的室温冲击韧性均明显高于无Ca 钢。Auger 能谱分析表明,Ca 在奥氏体晶界有明显的偏聚现象,并促进 C 的晶界偏聚,显著减小 S 的晶界偏聚。认为 Ca 的晶界偏聚及其对 S、C 晶界偏聚的互作用是影响钢的组织与冲击韧性的重要因素。
The effect of 0.005wt% Ca on hardenability and impact toughness and microstructure of 42MnCr steel at room temperature was studied by end quenching method. The content of Ca and other elements along the fracture surface was analyzed by Auger energy dispersive spectroscopy (AES) . The results show that the hardenability of micro-Ca steel is slightly higher than that of non-Ca steel. The impact toughness of micro-Ca steel at room temperature is obviously higher than that of non-Ca steel. Auger spectrum analysis shows that Ca has obvious segregation in the austenite grain boundaries and promotes the segregation of C in the grain boundaries and significantly reduces the segregation of S in the grain boundaries. It is considered that the segregation of Ca in the grain boundaries and the segregation of S and C in grain boundaries are the important factors affecting the microstructure and impact toughness of steel.