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合金结构钢在锻造加热时容易产生过热。现已确认:在高的奥氏体化温度下,硫化物夹杂溶解并在随后的冷却过程中沿奥氏体晶界析出,就导致了过热现象并伴随着冲击韧性的降低和石状断口的出现。在最后的淬火和回火处理之前,插入一道临界点以下的退火工艺,可以矫正过热钢材。本文对于这种能够改变MnS分布的热处理工艺进行了介绍和讨论。通过这种处理,石状断口被抑制,过热钢材的韧性得以恢复并且超过未过热时的水平。
Alloy steel is prone to overheating during forging heating. It has been confirmed that at high austenitizing temperatures, inclusions dissolve and the inclusions are precipitated along the austenite grain boundaries during the subsequent cooling, leading to overheating accompanied by a decrease in impact toughness and fracture of the stone appear. Before the final quenching and tempering, insert an annealing process below the critical point to correct overheated steel. This paper describes and discusses the heat treatment process that can change the distribution of MnS. By this treatment, the stone fracture is suppressed, and the toughness of the overheated steel is restored and exceeds that at the time of non-overheating.