不同热处理态下粉末冶金花纹钢的组织性能及拉伸断裂行为  

Microstructure,Properties and Tensile Fracture Behavior of Powder Metallurgy Decorative Pattern Steel in Different Heat Treatments

作　　者：李伟[1,2] 曹睿 闫英杰[1,2] LI Wei;CAO Rui;YAN Yingjie(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学有色金属先进加工与再利用国家重点实验室,兰州730050 [2]兰州理工大学材料科学与工程学院,兰州730050

出　　处：《材料导报》2022年第9期166-172,共7页Materials Reports

基　　金：国家自然科学基金(51761027,51961024,52071170)。

摘　　要：粉末冶金花纹钢因表面漂亮的花纹以及优异的力学性能而广泛应用于各种刀具材料中。本工作以鱼骨花纹纹路的粉末冶金花纹钢为研究对象,通过SEM、EDS、XRD、硬度试验、拉伸试验、弯曲试验、原位拉伸试验研究了两种热处理状态下粉末冶金花纹钢的组织、性能及拉伸断裂行为。结果表明:花纹纹路由C含量较高的黑色RWL34和C含量相对较低的白色PMC27马氏体不锈钢组成。淬火态和退火态基体组织分别为马氏体和铁素体组织,析出相均为以Cr为主的M_(23)C_(6)型碳化物。淬火态粉末冶金花纹钢的力学性能优异,拥有高强度的同时兼顾良好的韧性。在拉伸应力作用下,两种热处理态下粉末冶金花纹钢均为M_(23)C_(6)碳化物优先开裂,裂纹主要在RWL34条带沿着碳化物边界扩展,众多裂纹汇集形成主裂纹,直到断裂。Powder metallurgy decorative pattern steel is widely used in various tool materials because of its beautiful surface pattern and excellent mechanical properties.In this work,the powder metallurgy decorative pattern steel with herringbone pattern was used as a research object.The microstructure and fracture process of the powder metallurgy pattern steel decorative were investigated under two heat treatment states through SEM,EDS,XRD,hardness test,tensile test,bending test,and in-situ tensile test.The results show that the pattern is composed of black RWL34 with high C content and white PMC27 martensitic stainless steel with relatively low C content.The quenched matrix is martensite,the annealed matrix is ferrite,and the precipitation phases are all M_(23)C_(6) carbides with Cr as the main component.The quenched powder metallurgy decorative pattern steel has excellent mechanical properties,which include high strength and good toughness.Under the action of tensile stress,the cracks is preferentially produced in the M_(23)C_(6) carbides of the powder metallurgy decorative pattern steel under two heat treatment states,and then propagated along the carbide boundary in the RWL34 band,finally with more cracks connected,propagated and fractured.

关 键 词：粉末冶金花纹钢 微观组织 M_(23)C_(6)碳化物 力学性能 碳化物开裂 

分 类 号：TG113[金属学及工艺—物理冶金]