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Effect of a small increase in the Ni content on the properties of a laser surface clad Fe-based alloy

机译：Ni含量的少量增加对激光表面包覆的Fe基合金的性能的影响

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摘要

Two Fe-based alloys with a small variation in the Ni content, Fe-15.2Cr-5.1Ni and Fe-15.7Cr-7.1Ni (wt.%), were fabricated on a martensitic stainless steel 1Cr13 substrate by laser surface cladding (LSC) using a CO_2 laser and Ar shielding gas that was blown into a molten pool. Both LSC alloys exhibited typical rapid directional solidification structures. However, 2 wt.% Ni increase led to ～9% increase in the weight fraction of austenite, and ～5% increase in the area proportion of interdendritic regions, which contained the higher Cr contents. These microstructural changes caused a great reduction in the microhardness and great improvements in the resistance to electrochemical corrosion in 0.5 M H_2SO_4 solution and high temperature oxidation in air at 900℃. The reasons for these differences are discussed in detail.
机译：通过激光表面熔覆（LSC）在马氏体不锈钢1Cr13基底上制备了两种Ni基含量变化小的Fe基合金Fe-15.2Cr-5.1Ni和Fe-15.7Cr-7.1Ni（wt。％） ）使用吹入熔池的CO_2激光和Ar保护气。两种LSC合金均表现出典型的快速定向凝固组织。但是，Ni含量增加2 wt。％导致奥氏体重量分数增加〜9％，而枝晶间区域的面积比增加5％，其中Cr含量较高。这些微观结构的变化极大地降低了显微硬度，并显着提高了在0.5 M H_2SO_4溶液中的耐电化学腐蚀性能以及在900℃的空气中的高温氧化性能。这些差异的原因将详细讨论。

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