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本文研究了一种新型无钴超硬高速钢在马氏体成份和二次硬化之间的关系。采用“马氏体碳饱和度”(A~M=C_s~M/C_p~M,C_s~M—马氏体含碳量,C_p~M—马氏体中合金元素在回火时形成二次硬化碳化物所需碳量)作为描述马氏体中合金元素和碳(M—C)配比关系的参数。得出,①A~M和二次硬度有相当严格的依从关系。在通常的成分范围内,与某个合金元素或其总体比较,它对硬度的影响更大些。②当马氏体成分符合W_2C、Mo_2、V_4C_3及Cr_7C_3原子比时,获得最高的二次硬度—HRC69左右。 讨论了G、Steven平衡碳计算式。为解决某些合金化的定量问题,建议采用“钢的碳饱和度”(A=C_s/C_p)表征高速钢中M—C配比。C_s为钢的实际碳量,而C_p按Steven计算式。高速钢的成份可通过实验测定A值来决定。A值还可用于冶炼成份的控制以及淬火温度的选择等。
This paper studies the relationship between martensite composition and secondary hardening of a new type of cobalt-free super-hard high-speed steel. Martensite carbon saturation (A ~ M = C_s ~ M / C_p ~ M, C_s ~ M-martensite carbon content, C_p ~ M-martensite alloying elements form a secondary The amount of carbon required to harden the carbide) as a parameter describing the relationship between alloying elements and carbon (M-C) in the martensite. Obtain, ①A ~ M and secondary hardness has a very strict compliance. In the usual compositional range, with a certain alloying elements or its overall, it has a greater impact on the hardness. ②When the martensite composition complies with W_2C, Mo_2, V_4C_3 and Cr_7C_3 atomic ratio, the highest secondary hardness -HRC69 is obtained. The G, Steven equilibrium carbon equation is discussed. To solve some of the quantitative problems of alloying, it is advisable to characterize the M-C ratio in high-speed steel using “carbon saturation of the steel” (A = C_s / C_p). C_s is the actual carbon content of the steel, and C_p is calculated as Steven. The composition of high-speed steel can be determined experimentally A value. A value can also be used for the control of smelting ingredients and the choice of quenching temperature.