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通过拉伸、冲击和硬度等力学试验方法以及透射电镜(TEM)对9310渗碳钢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,得到了该钢的平衡相图。结果表明:9310钢淬火后具有最高的抗拉强度,随回火温度的升高,在100～350℃,9310钢的抗拉强度缓慢降低,当温度高于350℃时,其抗拉强度快速下降;9310钢的屈服强度随回火温度的升高而逐渐升高,在250～350℃时达到峰值,随后逐渐降低;冲击韧度随回火温度的升高而逐渐升高,在250℃时达到峰值,而随后在350～450℃为最小值,而温度高于450℃后又会升高。9310钢在150～250℃回火后细小的ε碳化物在板条马氏体基体中弥散析出分布,此时9310钢具有最佳的强韧性配合。
The mechanical properties and microstructure of 9310 carburized steel were studied by means of mechanical tests such as tensile, impact and hardness, as well as transmission electron microscopy (TEM). The balance of the steel was obtained by thermodynamic equilibrium calculation (Thermo-Calc software) Phase Diagrams. The results show that 9310 steel has the highest tensile strength after quenched. With the increase of tempering temperature, the tensile strength of 9310 steel decreases slowly at 100 ~ 350 ℃. When the temperature is higher than 350 ℃, the tensile strength of 9310 steel is fast The yield strength of 9310 steel gradually increased with the increase of tempering temperature and reached the peak at 250-350 ℃ and then decreased gradually.The impact toughness increased gradually with the increase of tempering temperature and reached the peak at 250 ℃ Peaked at 350-450 ° C, followed by a rise at temperatures above 450 ° C. 9310 steel after tempering at 150 ~ 250 ℃ ε carbides dispersed in the lath martensite matrix dispersion, then 9310 steel with the best strength and toughness with.