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

Wang Jincai; Huo Xiaoyang; Li Lei; Fan Beibei; Mi Guofa

doi:10.15980/j.tzzz.2022.10.012

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Laser Melting Solidification Properties of Inconel625, Mo-free Inconel625 and Alloy686 powders
Vol. 42, Issue 10, Pages: 1256-1262(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.10.012

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Wang Jincai, Huo Xiaoyang, Li Lei, et al. Laser Melting Solidification Properties of Inconel625, Mo-free Inconel625 and Alloy686 powders. [J]. Special Casting & Nonferrous Alloys 42(10):1256-1262(2022)
DOI：

Wang Jincai, Huo Xiaoyang, Li Lei, et al. Laser Melting Solidification Properties of Inconel625, Mo-free Inconel625 and Alloy686 powders. [J]. Special Casting & Nonferrous Alloys 42(10):1256-1262(2022) DOI： 10.15980/j.tzzz.2022.10.012.

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。

Abstract

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.