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本文主要论述了W_5Mo_5Gr_4V_2高速钢萘状断口的形成过程。试验证明,萘状断口粗大奥氏体晶粒的形成是一个由畸变能而不是晶界能驱动的,受二次加热时析出的弥散碳化物的“回溶”所控制的不均匀再结晶过程。进而我们研究出了一种预防和消除萘状断口的“稳定化处理”新工艺。实验证明,经45分钟的“稳定化处理”可以预防重复加热时萘状断口的形成。经分95钟的“稳定化处理”可以消除萘状断口。从而挽救了因萘状断口而报废的工具,并使抗弯强度和冲击韧性有不同程度的提高。
This paper mainly discusses the forming process of naphthalene fracture in W_5Mo_5Gr_4V_2 high speed steel. The experimental results show that the formation of coarse austenite grains in naphthalene fractures is driven by the distortion energy rather than the grain boundaries. Due to the non-uniform recrystallization controlled by the “back-dissolving” of the precipitated carbide during the secondary heating, . Furthermore, we have developed a new “stabilization process” to prevent and eliminate naphthalene fractures. Experiments show that after 45 minutes of “stabilization” can prevent the formation of naphthalene fractures repeated heating. After 95 minutes of “stabilization” can be eliminated naphthalene fracture. Thus saving the tool scrapped due to naphthalene fracture, and the flexural strength and impact toughness improved to varying degrees.