【摘要】 采用Thermo-Calc热力学软件模拟了30Cr3Si2Mn2NiNb钢奥氏体化时平衡相的演化规律以及非平衡态相的演化规律,研究了合金元素C,Mo,Nb和V对实验钢中未溶相的影响。通过SEM,XRD对30Cr3Si2Mn2NiNb钢淬火态组织进行实验观察及分析。结果表明:常规奥氏体化处理后,钢中未溶相主要有富Nb的MC相及富Mo的M6C相;当奥氏体化温度高于950℃时,M6C相完全溶解,MC相显著减少;30Cr3Si2Mn2NiNb钢适宜的奥氏体化温度为950~1000℃。计算结果指出,C,Nb抑制MC未溶相的溶解,V,Mo促进MC未溶相的溶解。更多还原

【Abstract】 Evolution of equilibrium phases and non-equilibrium phases in 30Cr3Si2Mn2NiNb steel during austenitizing was simulated via Thermo-Calc thermodynamic software.Effect of C,Mo,Nb and V on undissolved phases in steel was studied.Experimental analysis was carried out by SEM and XRD on microstructure of as-quenched 30Cr3Si2Mn2NiNb steel.Results show that there are Mo-enriched M6C and Nb-enriched MC phases in steel after austenitizing below 950℃,and MC phases are dramatically reduced while M6C phases are almostly dissolved above 950℃.The proper austenitizing temperature of 30Cr3Si2Mn2NiNb steel is 950-1000℃.The results of calculation indicate that C,Nb retard dissolution of MC phase while V,Mo promot the dissolution.更多还原