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Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal Spraying

机译:热喷涂溶液硬化316L粉末原料的相位稳定性和微观结构演化

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摘要

A solution-hardening of AISI 316L stainless-steel powder was conducted. The expansion of the crystal lattice and a strong increase in the nanoindentation hardness confirm the successful diffusion of carbon and nitrogen in the interstices. A multiphase state of the powder feedstock with phase fractions of the metastable S-phase (expanded austenite) mainly at the particle’s edge, and the initial austenitic phase within the core was found. Thermal spraying using high velocity oxy-fuel (HVOF) and atmospheric plasma spraying (APS) prove the sufficient thermal stability of the Sphase. Microstructural investigations of the HVOF coating reveal the ductility of the S-phase layer, while the higher heat load within the APS cause diffusion processes with the initial austenitic phase. The lattice expansion and the nanoindentation hardness decrease during thermal spraying. However, the absence of precipitates ensures the sufficient heat stability of the metastable S-phase. Even though further efforts are required for the thermochemical treatment of powder feedstock, the results confirm the feasibility of the novel powder treatment approach.
机译:进行AISI 316L不锈钢粉末的溶液硬化。晶格的膨胀和纳米凸缘硬度的强烈增加确认了间隙中碳和氮的成功扩散。发现主要处于颗粒边缘的亚稳态S相(膨胀奥氏体)的相级分的粉末原料的多相状态,并发现核心内的初始奥氏体相。使用高速氧气(HVOF)和大气等离子体喷涂(APS)的热喷涂证明了SPHase的充分热稳定性。 HVOF涂层的微观结构研究显示了S-相层的延展性,而APS内的较高热负荷导致初始奥氏体相的扩散过程。晶格膨胀和纳米狭窄硬度在热喷涂期间减少。然而,没有沉淀物确保了亚稳态S相的足够的热稳定性。尽管粉末原料的热化学处理需要进一步努力,但结果证实了新型粉末处理方法的可行性。

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