HPSLM工艺参数对高氮不锈钢氮含量及组织的影响  

Effects of HPSLM Process Parameters on Nitrogen Content and Microstructure of High Nitrogen Stainless Steel

作　　者：王书桓 孙鑫 赵定国 王亚超 任建彪 Wang Shuhuan;Sun Xin;Zhao Dingguo;Wang Yachao;Ren Jianbiao(School of Metallurgy and Energy,North China University of Science and Technology)

机构地区：[1]华北理工大学冶金与能源学院

出　　处：《特种铸造及有色合金》2023年第8期1054-1059,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52074128);河北省自然科学基金资助项目(E2020209014,E2019209597);河北省高校基本科研业务费研究资助项目(JYG2021004)。

摘　　要：通过高压选区激光熔化制备高氮不锈钢,研究工艺参数对不锈钢中N含量、组织与硬度的影响。结果表明,合金中N含量与腔内熔炼压力成正比,N含量最高可达1.05%,腔内熔炼压力促进N的渗入并抑制氮的逸出;显微组织主要由细小等轴晶组成,晶粒尺寸为10~25μm;随着腔内熔炼压力增大,晶粒尺寸逐渐变小,显微硬度增大,主要是由于腔内熔炼压力增大,固溶N含量增加,晶粒细化,使显微硬度提高。The effects of process parameters on nitrogen content,microstructure and hardness of high nitrogen stainless steel prepared by high-pressure selective laser melting(HPSLM)were investigated.The results indicate that the nitrogen content in alloy is proportional to the luminal pressure,which can reach up to 1.05%,and the luminal pressure promotes the infiltration and inhibits the escape of nitrogen.The microstructure is mainly composed of fine equiaxed grains with grain size of 10~25μm.With the increase of luminal pressure,the grain size is gradually decreased and the microhardness is increased,which is mainly attributed to the increase of solid nitrogen content,resulting in the grain refinement.

关 键 词：高压选区激光熔化 N含量 微观组织 晶粒尺寸 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG142.71[一般工业技术—材料科学与工程]