盐浴氮化+氧化和QPQ处理对H13模具钢抗铝液腐蚀性能的影响  

Effects of Salt Bath Nitriding+Oxidation and QPQ Treatment on Corrosion Resistance of H13 Die Steel in Aluminum Solution

作　　者：窦靖杰 陈广 王均[1] DOU Jingjie;CHEN Guang;WANG Jun(School of Mechanical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学机械工程学院,四川成都610065

出　　处：《热加工工艺》2023年第6期88-91,97,共5页Hot Working Technology

基　　金：四川省科技计划项目(2020YFG0095)。

摘　　要：H13模具钢作为铝型材的成型模具常被高温铝液腐蚀而失效。研究了盐浴氮化+氧化和QPQ处理工艺对H13模具钢抗铝液腐蚀性能的影响。使用SEM和XRD对比分析处理前后试样的显微组织,使用维氏硬度计分析铝液腐蚀前后渗层的硬度变化。结果表明,两种处理后在试样表面都形成了致密的Fe_(3)O_(4)氧化层和氮化层。经过高温铝液腐蚀后基体和渗氮层的硬度都有一定程度的下降,而渗氮层的硬度(600.9 HV0.1)仍然比基体的硬度(301.8 HV0.1)高1倍左右。腐蚀后,试样表面的致密氧化膜仍然存在,并且铝液失重率下降了90%以上,表明两种表面处理获得的试样的抗铝液腐蚀性能较好。同时,盐浴氮化+氧化工艺对优化H13钢的硬度和抗铝液侵蚀能力更为明显。H13 die steel as aluminum profile molding mold is often corroded by high temperature aluminum liquid failure.The effects of salt bath nitriding+oxidation and QPQ treatment on the corrosive properties of H13 die steel were studied.The microstructure of the samples before and after treatment was analyzed using SEM and XRD,and the hardness changes of the aluminum layer before and after corrosion were analyzed using a Vicker hardness meter.The results show that the dense Fe_(3)O_(4) oxide layer and nitride layer are formed on the surface of the sample after the two treatments.After high temperature liquid aluminum corrosion,the hardness of the matrix and nitride layer decreases to a certain extent.However,the hardness of the nitriding layer(600.9 HV0.1)is still about 1 times higher than the hardness of the substrate(301.8 HV0.1).After corrosion,the dense oxide membrane on the sample surface remains present.And the weight loss rate of aluminum liquid decreases by more than 90%,it shows that the corrosion resistance of the samples obtained from both surface treatments is good.At the same time,salt bath+oxidation process to optimize the hardness and aluminum liquid corrosion resistance of H13 steel are more obvious.

关 键 词：H13模具钢 盐浴氮化+氧化 QPQ处理 铝液腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]