喷射成形M3型高速钢的致密化处理  

Densification of Spray-formed High Speed Steel

作　　者：卢林[1] 吴文恒[1] 张亮[1] 张济山[2] LU Lin;WU Wenheng;ZHANG Liang;ZHANG Jishan(Shanghai Research Institute of Materials,Shanghai Engineering Research Center of 3D Printing Materials,Shanghai 200437;State Key Laboratory for Advanced Metals&Materials,University of Science and Technology Beijing,Beijing 100083)

机构地区：[1]上海材料研究所,上海3D打印材料工程技术研究中心(筹),上海200437 [2]北京科技大学,新金属材料国家重点实验室,北京100083

出　　处：《材料导报》2017年第A01期86-89,共4页Materials Reports

基　　金：上海3D打印材料工程技术研究中心(15DZ2251100);国家重点基础研究发展计划(2011CB606303)

摘　　要：利用Gleeble-1500模拟了喷射成形高速钢的高温变形,采用扫描电镜观察变形后的组织,并基于排水法测试了试样变形前后的孔隙率,重点分析不同变形量对沉积态组织中孔隙消除和碳化物破碎的影响。结果表明,随着变形量的增大,孔隙率降低,片状共晶碳化物得到破碎、球化。能有效降低孔隙率及破碎共晶碳化物的临界变形量分别为40%和50%;碳化物的演变是高温球化与机械破碎两个过程相互作用的结果;选用80%的变形量可以获得最优的变形组织。Hot deformation as well as the porosity and microstructure of spray-formed M3 high speed steel was investigated in this paper.Particular emphasis was placed on the effect of height reduction on the elimination of porosity and the broken-up of carbides.The results show that the amount of porosity can be obviously decreased by increasing the height reduction which also plays a key role in breaking up eutectic carbides.The critical height reduction for the elimination of porosity and breakdown of the eutectic carbides is 40%and 50%,respectively.With the height reduction of 80%,it can obtain fine microstructures with the least porosity and spheroidal carbide.

关 键 词：喷射成形 高速钢 高温变形 孔隙 碳化物 

分 类 号：TG142.45[一般工业技术—材料科学与工程]