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利用金相显微镜、扫描电镜等试验手段,研究了固溶温度及固溶时间对马氏体/铁素体双相不锈钢微观组织和力学性能的影响。试验结果显示,随着固溶温度的升高,第二相逐渐溶解于基体中,马氏体含量逐渐增加,在力学性能方面表现为强度逐渐增大,塑韧性降低。通过相分析可知,基体中第二相为M23C6,且固溶温度越高,第二相(M23C6)在基体中的残留越少,当固溶温度高于1100℃时,第二相完全溶解到基体中。
The effects of solution temperature and solution time on microstructure and mechanical properties of martensitic / ferritic duplex stainless steel were studied by means of metallographic microscope and scanning electron microscope. The experimental results show that with the increase of solution temperature, the second phase gradually dissolves in the matrix, the martensite content gradually increases, and the mechanical properties show that the strength gradually increases and the plastic toughness decreases. The phase analysis shows that the second phase in the matrix is M23C6, and the higher the solution temperature is, the less residual phase in the matrix of the second phase (M23C6) is. When the solution temperature is higher than 1100 ° C, the second phase is completely dissolved In the matrix.