Effect of Powder Feed Rate on the Structure and Properties of Plasma Deposited Stellite 6 Cladding on SS316L Stainless Steel Substrate

IF 0.6 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Metal Science and Heat Treatment Pub Date : 2024-04-13 DOI:10.1007/s11041-024-00991-w

Avishkar Bhoskar, Vivek Kalyankar

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Abstract

The effect of powder feed rate (PFR) on the structure, phase composition, and mechanical properties of Stellite 6 coating deposited on SS316L steel substrate by plasma welding is studied. It is shown that a high powder feed rate leads to delamination of the coating, and a low PFR leads to an extreme melting depth of the substrate due to the high thermal energy. It is shown that a cobalt-rich fcc phase is formed at low PFR, while the M₂₃C₆, M₆C, MC, and M₇C₃ phases (M is W, Cr, Co, and Mo) are metastable. At high PFRs, a cobalt-rich hcp phase is formed in the coating structure. The cobalt-based hcp phase is more resistant to sliding wear than the other phases. The coatings deposited at higher PFRs increase the hardness and the wear resistance due to formation of an hcp cobalt phase in the structure, but the bond between the substrate and the coating is worse than when using low PFRs. Therefore, for critical components used in the petrochemical industry, Stellite 6 coatings deposited on stainless steel at lower powder feed rates are recommended.

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粉末进给速率对 SS316L 不锈钢基材上等离子沉积 Stellite 6 涂层结构和性能的影响

研究了粉末进给率（PFR）对通过等离子焊接沉积在 SS316L 钢基材上的 Stellite 6 涂层的结构、相组成和机械性能的影响。结果表明，高给粉率会导致涂层分层，而低 PFR 会导致基材在高热能作用下达到极深的熔化深度。研究表明，在低 PFR 条件下会形成富钴 fcc 相，而 M23C6、M6C、MC 和 M7C3 相（M 为 W、Cr、Co 和 Mo）则会发生蜕变。在高 PFR 条件下，涂层结构中会形成富钴 hcp 相。钴基 hcp 相比其他相更耐滑动磨损。由于在涂层结构中形成了 hcp 钴相，以较高的 PFR 沉积的涂层可提高硬度和耐磨性，但基体和涂层之间的结合力比使用低 PFR 时要差。因此，对于石化工业中使用的关键部件，建议使用较低的粉末进给率在不锈钢上沉积 Stellite 6 涂层。

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来源期刊

Metal Science and Heat Treatment 工程技术-冶金工程

CiteScore

1.20

自引率

16.70%

发文量

102

审稿时长

4-8 weeks

期刊介绍： Metal Science and Heat Treatment presents new fundamental and practical research in physical metallurgy, heat treatment equipment, and surface engineering. Topics covered include: New structural, high temperature, tool and precision steels; Cold-resistant, corrosion-resistant and radiation-resistant steels; Steels with rapid decline of induced properties; Alloys with shape memory effect; Bulk-amorphyzable metal alloys; Microcrystalline alloys; Nano materials and foam materials for medical use.