High-performance martensitic stainless steel nanocomposite powder for direct energy deposition prepared by ball milling  

作　　者：Zhen Wang Shu-Rong Xu Qing-Xuan Sui Jiang Wang Bo Liu Hao Wen Tian-Yi Xiao Quan Yuan Feng-Jun Zhao Jun Liu 

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha,410083,China [2]Jinchuan Nickel Cobalt Research and Design Institute,Jinchuan Group Co.,Ltd,Jinchang,737100,China

出　　处：《Rare Metals》2023年第7期2419-2432,共14页稀有金属（英文版）

基　　金：financially supported by Gansu Science and Technology Department(No.21ZD3GC001)。

摘　　要：Direct energy deposition(DED)has great potential for the production of stainless steel matrix nanocomposite parts.However,the propensity of nanoparticle agglomeration leads to the difficulty in realizing homogenous dispersion of nanoparticles in the matrix.In this study,a series of agglomeration-free nanoWC-Co-reinforced 420 stainless steel matrix nanocomposite powders with high flowability were prepared by ball milling under the optimal parameters.The effect of ball milling time on the properties of the composite powders was investigated.Excellent powder properties ensure the DED processing performance.Furthermore,the corresponding composites were fabricated by DED,and the effects of nano-WC-Co content on the properties of the composites were comprehensively investigated.The contact angles between the single pass cladding layer and the substrate change with increasing nano-WC-Co content(decrease from 127.38°to 113.07°).The different contact angles will significantly influence the quality of the multipass cladding layer.Furthermore,the addition of nanoWC-Co leads not only to further grain refinement but also to more pronounced isotropy of the micros tructure.With the increase in nano-WC-Co content,the corrosion resistance is significantly improved(62.28%lower corrosion current for 420-15 wt%nano-WC-Co than for 420).

关 键 词：Steel matrix composites Direct energy deposition(DED) Ball milling time Contact angle MICROSTRUCTURE Mechanical property 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TB383.3[金属学及工艺—金属材料]