Inconel625及其去Mo和Alloy686粉末激光熔凝性能研究  

Laser Melting Solidification Properties of Inconel625, Mo-free Inconel625 and Alloy686 powders

作　　者：王进才 霍晓阳[1] 李雷 樊贝贝 米国发[1] Wang Jincai;HuoXiaoyang;Li Lei;Fan Beibei;Mi Guofa(School of Materials Science and Engineering,Henan Polytechnic University;Institute of Materials,Shanghai Dianji University)

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454000 [2]上海电机学院材料学院,上海200240

出　　处：《特种铸造及有色合金》2022年第10期1256-1262,共7页Special Casting & Nonferrous Alloys

基　　金：上海市科委“科技创新行动计划”重大专项基金资助项目(19511105402)。

摘　　要：为延长20G高压锅炉管的使用寿命,采用激光熔凝技术在20G钢板表面制备了Inconel625及其去Mo和Alloy686镍基合金粉末的熔凝层,研究了3种镍基合金对激光熔凝层微观组织、硬度、抗拉强度,及550℃时高温耐腐蚀性能的影响。结果表明,Inconel625的晶粒更集中偏向<001>方向,其次是Inconel625去Mo的晶粒,Alloy686合金的晶粒虽有部分偏向于<101>方向,但主要方向还是<001>方向且晶粒大小更均匀。另外,Alloy686合金的硬度和抗拉强度最高,耐腐蚀性能最好,但塑韧性最差,伸长率只有10.8%。综合考虑,Inconel625熔凝层最适用于制备锅炉管的耐腐蚀层。In order to improve the service life of 20 G high pressure boiler tube, the melting-solidified layer of Inconel625, Mo-free Inconel625 and Alloy686 nickel-base alloy powder was prepared on the surface of 20 G steel plate by laser melting solidification. Effects of nickel-based alloys on microstructure, hardness, tensile strength and high temperature corrosion resistance of laser melting-solidified layer at 550 ℃ were investigated. The results indicate that the grain size of Inconel625 is inclined to concentrate to <001> direction, followed by the grain of Mo-free Inconel625. The grain size of Alloy686 is partial inclined to<101> direction, however, the primary direction is <001> direction with homogeneous grain.The hardness, tensile strength and corrosion resistance of Alloy686 are optimal, while the plastic toughness is the worst, where the elongation is only 10.8%. After overall consideration, melting-solidified layer of Inconel625 is most suitable for the corrosion resistant layer of boiler tube.

关 键 词：激光熔凝 晶粒取向 抗拉强度 耐腐蚀性能 

分 类 号：TG456.7[金属学及工艺—焊接]