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关于钴和铝在高速钢中的作用,曾经有过许多的研究。钴主要是提高钢的硬性,其机理是钴在钢中绝大部分溶于固体,使莱氏体共晶的熔化温度提高,因而可以提高热处理温度,而不发生晶粒显著长大,使奥氏体能够溶解更多的钨、钼、铬、钒和碳,从而提高二次硬度数值,提高热硬性。但随着钴含量的增加,高速钢淬回火后的脆性提高,钢的韧性下降。少量的铝在高速钢中具有与钴相同的作用,可以提高钢的红硬
There have been many studies on the role of cobalt and aluminum in HSS. Cobalt is mainly to improve the rigidity of the steel, the mechanism is that most of the cobalt dissolved in the solid steel, so that the ledeburite eutectic melting temperature increase, which can increase the heat treatment temperature, without significant grain growth, the Austrian The body can dissolve more tungsten, molybdenum, chromium, vanadium and carbon, thereby increasing the secondary hardness values, improve the hot hardness. However, with the increase of cobalt content, the brittleness of high-speed steel after quenching and tempering increased, the toughness of steel decreased. Small amounts of aluminum have the same effect as cobalt in high-speed steels and can increase the red hardness of the steel