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通过拉伸、冲击和断裂韧性等力学试验方法以及扫描电镜对低合金超高强度钢30Cr3SiNiMoV的力学性能和组织进行了研究,并采用热力学平衡计算(Thermo-Calc软件)方法,得到该钢的平衡相图。结果表明:在实验条件下,随回火温度的升高,30Cr3SiNiMoV钢的抗拉强度和屈服强度逐渐升高,达到最大值后又逐渐降低;而冲击韧度随温度的升高总体上呈现下降的趋势,冲击断口形貌随回火温度的升高逐渐由韧窝型断口向准解理型断口过渡;30Cr3SiNiMoV钢最佳的回火温度为240℃。
The mechanical properties and microstructure of 30Cr3SiNiMoV low-alloyed ultra-high strength steel were studied by means of mechanical tests such as tensile, impact and fracture toughness and scanning electron microscopy. The balance of the steel was obtained by thermodynamic equilibrium calculation (Thermo-Calc software) Phase Diagrams. The results show that under the experimental conditions, the tensile strength and yield strength of 30Cr3SiNiMoV steel increase gradually with the increase of tempering temperature, reach the maximum and then decrease gradually; while the impact toughness decreases with the increase of temperature The impact fracture morphology gradually changes from dimple-type fracture to quasi-cleave fracture with the increase of tempering temperature. The optimum tempering temperature of 30Cr3SiNiMoV steel is 240 ℃.