喷射成形工艺参数对沉积坯质量的影响  

Effects of Spray Forming Parameters on Properties of As-deposited Billet

作　　者：卢林[1] 吴文恒[1] 龙倩蕾 张亮[1] 张济山[2] LU Lin;WU Wenheng;LONG Qianlei;ZHANG Liang;ZHANG Jishan(Shanghai Engineering Research Center of 3D Printing Materials,Shanghai Research Institute of 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,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》2019年第3期390-394,共5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：影响喷射成形沉积坯质量的参数众多,除材料本身特性参数外,制备工艺是决定沉积坯质量优劣的关键参数。本实验主要从沉积坯的外形、孔隙率、微观组织三个方面研究喷射成形过热度、雾化压力两个关键工艺参数对M3型高速钢沉积坯质量的影响规律。研究结果表明:过热度和雾化压力对沉积坯外形、孔隙率及微观组织的影响显著。过热度降低或雾化压力提高,沉积坯组织都将得到细化。过热度增大,沉积坯底部孔隙率降低,而边缘、表面、心部区域孔隙率先减小后增大。雾化压力提高,沉积坯底部、边缘、表面区域的孔隙率增大,而心部区域孔隙率先减小后增大。在过热度为160～180℃,雾化压力为0.45～0.50 MPa的条件下,单喷嘴雾化系统可获得外形优良、心部孔隙率低于4%、组织均匀细小的M3型高速钢沉积坯。There are many parameters that affect the quality of spray forming billet.Apart from the own characteristics of the material,the process para-meters play a crucial role in determining the quality of the billet.The effects of spray forming processing parameters on properties of as-deposited billet were studied in this paper.Emphases were placed on the effects of melt superheat and gas pressure on the shape,porosity and solidification microstructures of as-deposited billet of M3 high speed steel.The results showed that there was a remarkable impact of melt superheat and gas pressure on the properties of as-deposited billet.The obviously refined solidification microstructure could be achieved whether by decreasing the melt superheat or increasing of the gas pressure.The porosity of the bottom dropped with increasing melt superheat,while the porosity in the edge,surface and center region decreased first and then increased with increasing melt superheat.On the other hand,the value of P(porosity)increased monotonically with the rise of gas pressure in the bottom,surface,and periphery zones,whereas the porosity of the central zone decreased firstly and then grew with the increase of gas pressure.A high quality as-deposited billet with the desired shape,low porosity and fine microstructure could be obtained by spray forming under the melt superheat of 160-180℃and gas pressure of 0.45-0.5 MPa,respectively.

关 键 词：喷射成形 沉积坯 高速钢 过热度 孔隙率 

分 类 号：TB31[一般工业技术—材料科学与工程]