深冷处理在模具强韧化处理中的应用  

Effects and application of Subzero Treatment on Cold-forging Dies

作　　者：刘劲松[1] 蒲玉兴[2] 

机构地区：[1]长沙航空职业技术学院,湖南长沙,410124 [2]湖南大学材料科学与工程学院,湖南长沙,410008

出　　处：《模具工程》2010年第11期61-63,共3页Mould &Die Project

摘　　要：本文论述了深冷处理回火后组织与性能的关系，试验结果与现场使用表明：对模具钢采用-196℃氮深冷处理可使组织发生明显变化．有效促使残留奥氏体向马氏体转变及超细碳化物的析出。可获得较佳的综合力学性能，显著提高了模具的使用寿命，具有十分重要的实际应用价值。The relationship between the mechanical properties and microstructure after quenching and deep freeze treatment has been explained. The testing results and application in worksite have shown that Cryogenic treatment of dies steels by virtue of liquid Nitrogen at 196 below zero may result in an obvious change of its microstructure ,and thereby it effectively helps transforms form retained austenite into martensite and precipitate fine carbides, which brings better comprehensive mechanical properties to dies. The work-life of the Cold- forging Dies have been increased obviously and thus it has significant use value.

关 键 词：深冷处理 残留奥氏体 微细碳化物 显微组织 耐磨性 

分 类 号：TG156.91[金属学及工艺—热处理]