刘伯温精选单双

模具钢冷处理裂纹与预防

发布时间:2015-11-09 10:24:15 浏览:2215次

模具钢多为中,高碳合金钢,淬火后还有部分过冷奥氏体未转变成马氏体,保留在使用状态中成为残余奥氏体,影响使用性能。若置于零度以下继续冷却,能促使残余奥氏体发生马氏体转变,因此,冷处理的实质是淬火继续。室温下淬火应力和零度下淬火应力叠加,当叠回应力超过该材料强度极限时便形成冷处理裂纹。
预防措施:

(1)CUIHUOHOULENGCHULIZHIQIANJIANGMOJUZHIYUFEISHUIZHONGZHU30—60min,KEXIAOCHU15%-25%CUIHUONEIYINGLIBINGSHICANYUAOSHITIWENDINGHUA,ZAIJINXING-60℃CHANGGUILENGCHULI,HUOJINXING-120℃SHENLENGCHULI,WENDUYUDI,CANYUAOSHITIZHUANBIANCHENGMASHITILIANGYUDUO,DANBUKENENGQUANBUZHUANBIANWAN,SHIYANBIAOMING,YUEYOU2%-5%CANYUAOSHITIBAOLIUXIALAI,ANXUYAOBAOLIUSHAOLIANGCANYUAOSHITIKESONGCHIYINGLI,QIHUANCHONGZUOYONG,YINCANYUAOSHITIYOURUANYOUREN,NENGBUFENXISHOUMASHITIHUAJIJUPENGZHANGNENGLIANG,HUANHEXIANGBIANYINGLI;

(2)LENGCHULIWANBIHOUQUCHUMOJUTOURURESHUIZHONGSHENGWEN,KEXIAOCHU40%-60%LENGCHULIYINGLI,SHENGWENZHISHIWENHOUYINGJISHIHUIHUO,LENGCHULIYINGLIJINYIBUXIAOCHU,BIMIANLENGCHULILIEWENXINGCHENG,HUODEWENDINGZUZHIXINGNENG,QUEBAOMOJUCHANPINCUNFANGHESHIYONGZHONGBUFASHENGJIBIAN。

(编辑:jxadmin)