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针对17-4PH马氏体不锈钢的热老化行为,之前的试验结果显示,该材料在300℃左右的高温环境下长时间服役后,其力学性能会发生明显劣化,表现为韧脆转变温度大幅度下降、上平台能量降低、硬度提高以及塑性变差。本工作主要针对已发生明显热老化的17-4PH马氏体不锈钢样品,通过SEM、OM、EDX和3DAP等微观分析手段,探究了热老化后该材料的组织变化及元素分布,试图找到其热老化效应产生的机制。
According to the thermal aging behavior of 17-4PH martensitic stainless steel, the previous experimental results show that the mechanical properties of the 17-4PH martensitic stainless steel deteriorate obviously after long service time at about 300 ℃, Drop, lower energy on the platform, increased hardness and poor ductility. This work mainly focuses on 17-4PH martensitic stainless steel samples which have been significantly aged. The microstructural changes and elemental distribution of the material after thermal aging have been investigated by means of SEM, OM, EDX and 3DAP. Aging effect of the mechanism.