论文部分内容阅读
精密冲裁模精度要求很高、刃口纤细,对模具的尺寸稳定性及强韧性提出严格要求。CrWMn钢常作为此类模具的材料。 CrWMn是一种常用的合金工具钢,钢中具有较多量的碳化物,Mn和Cr可提高钢的淬透性,W细化晶粒,改善韧性,故有较高的淬透性和耐磨性。但由于CrWMn钢热加工时,易在奥氏体晶界上形成网状分布的二次碳化物,也显著增加了工件脆性,降低了冲击韧性,使模具的寿命缩短。
Precision blanking precision requirements, the edge slim, the dimensional stability of the mold and toughness put forward strict requirements. CrWMn steel is often used as the material for such molds. CrWMn is a commonly used alloy tool steel with a relatively large amount of carbides in the steel. Mn and Cr improve the hardenability of the steel, refine the grains, improve the toughness, and therefore have high hardenability and wear resistance Sex. However, due to CrWMn steel thermal processing, easy to form reticular distribution of secondary carbides in the austenite grain boundary, but also significantly increased the workpiece brittleness, reducing the impact toughness, shorten the life of the mold.