热处理对含铝1.2367热作模具钢组织转变的影响Effect of heat treatment on microstructure transformation of aluminum-containing 1.2367 hot working die steel
胡艺耀,周健,马党参,迟宏宵,苏杰
摘要(Abstract):
利用OM,SEM,EDS和硬度测试等分析手段,研究了含铝1.2367钢热处理中退火组织及淬火组织转变规律,并利用Thermo-Calc软件对钢中合金相的变化规律进行了计算。结果表明:添加铝不改变1.2367钢平衡相的种类,但能提高钢的Ac1点,使α→γ转变的温度区间变宽;铝的添加在偏析严重区域引起了非平衡结晶产生了液析碳化物,同时减少了退火过程中合金碳化物析出的数量;当低温淬火时,铝的添加降低了淬火硬度,在Mo和V的复合作用下提高了碳化物的溶解温度,由于未溶碳化物的钉扎作用延缓了晶粒的粗化;进一步增加淬火温度,碳化物大量溶解,但由于偏析导致偏析带上的未溶碳化物分布不均匀,再加上部分氧化铝和氮化铝的作用,引起了混晶。
关键词(KeyWords): 铝;热作模具钢;组织;液析碳化物;混晶
基金项目(Foundation):
作者(Author): 胡艺耀,周健,马党参,迟宏宵,苏杰
DOI: 10.13289/j.issn.1009-6264.2016.04.031
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