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以海洋结构低碳钢为研究对象,通过添加Ni、Mo、Mn等合金元素,熔炼制备了实验用钢。探讨了热处理工艺对实验钢力学性能的影响。结果表明:850℃一次淬火1 h+760℃二次淬火1 h,再经575℃进行回火处理2 h后的实验钢性能最佳,此时抗拉强度为1151.7 MPa,屈服强度为1127.9 MPa,断后伸长率为16.9%,冲击功为220.6 J。二次淬火和添加合金元素有助于回火稳定性的提高,同时可以细化晶粒,有利于实验钢力学性能的提高。
Taking marine structural mild steel as the research object, experimental steel was prepared by melting alloying elements such as Ni, Mo and Mn. The effect of heat treatment process on the mechanical properties of experimental steel was discussed. The results show that the best performance of the experimental steel after quenching at 850 ℃ for 1 h and secondary quenching at 760 ℃ for 1 h followed by tempering at 575 ℃ for 2 h is 1151.7 MPa and yield strength of 1127.9 MPa , Elongation at break of 16.9% and impact energy of 220.6 J. Secondary quenching and adding alloying elements help to improve the stability of tempering, and can refine the grain, which is conducive to the improvement of the mechanical properties of the experimental steel.