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本文研究了40 Cr钢的热处理新工艺,即经过1280℃淬火,获得淬火板条马氏体的亚结构,然后再经810℃第二次淬火,获得细晶的板条马氏体。试验结果表明,屈服强度和冲击韧性显著提高,并且抑制了低温(350℃)回火脆性。 本文还对改善性能以及抑制回火脆性的微观机理进行了分析,认为粒状碳化物形态是改善机械性能、抑制回火脆性的主要原因。
In this paper, a new heat treatment process of 40 Cr steel was studied. After quenching at 1280 ℃, martensite sub-structure of quenched lath was obtained, and then quenched at 810 ℃ for the second time to obtain fine-grained lath martensite. Test results show that the yield strength and impact toughness increased significantly, and inhibited the low temperature (350 ℃) temper brittleness. In this paper, the microscopic mechanism of improving the performance and suppressing the temper brittleness is also analyzed. It is considered that the granular carbide morphology is the main reason to improve the mechanical properties and suppress the temper embrittlement.