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“失碳”问题是一个在保护气氛热处理中带有普通性的问题。对于钢丝、钢带等产品的危害性甚大。对其产生的原因,传统的观点认为是由于气氛的“碳势”不足所造成的。然而,按此观点做的许多努力却未能达到预期的目的。本文根据理论分析和试验结果提出,在重结晶温度(Ac_1)以下,由于钢料是由铁素体和渗碳体两相构成的,对此使用“碳势”概念是不妥当的。再结晶退火时的“失碳”主要发生在渗碳体相,钢材表面的氧化铁则是不可忽略的重要氧化剂。根据生产中气氛难以达到使渗碳体不失碳的程度,本文提出了几种解决“失碳”问题的途径,并应用于GCr15钢丝生产取得了良好的效果。
The problem of “loss of carbon” is a matter of commonality in the heat treatment of protective atmosphere. For wire, steel and other products of great harm. The reason for its formation, the traditional view that is due to the atmosphere “carbon potential ” caused by the lack of. However, many of the efforts made in this regard failed to achieve the intended purpose. Based on the theoretical analysis and experimental results, we propose that the concept of “carbon potential ” is not appropriate because the steel is composed of two phases of ferrite and cementite below the recrystallization temperature (Ac_1). Recrystallization annealing “carbon loss ” occurs mainly in the cementite phase, the iron oxide on the surface of the steel is an important oxidant can not be ignored. According to the production of the atmosphere is difficult to achieve the degree of carbon loss without losing carbon, this paper presents several ways to solve the “loss of carbon” problem, and applied to GCr15 steel production has achieved good results.