Effect of Annealing Temperature on Microstructure and Properties of Laser Cladding Stellite 6 Alloy on 12Cr1MoV Steel Surface

FU Heng; GU Yufen; SHI Yu; WANG Quanbo

doi:10.7512/j.issn.1001-2303.2026.02.04

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Effect of Annealing Temperature on Microstructure and Properties of Laser Cladding Stellite 6 Alloy on 12Cr1MoV Steel Surface
Vol. 56, Issue 2, Pages: 40-47(2026)
Received：16 February 2025，

Revised：2025-04-28，

Published：20 February 2026
DOI： 10.7512/j.issn.1001-2303.2026.02.04
稿件说明：

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符恒，顾玉芬，石玗，等.退火温度对12Cr1MoV钢表面激光熔覆Stellite 6合金组织与性能的影响［J］.电焊机，2026，56（2）：40-47. DOI： 10.7512/j.issn.1001-2303.2026.02.04.

FU Heng, GU Yufen, SHI Yu, et al.Effect of Annealing Temperature on Microstructure and Properties of Laser Cladding Stellite 6 Alloy on 12Cr1MoV Steel Surface[J].Electric Welding Machine, 2026, 56(2): 40-47. DOI： 10.7512/j.issn.1001-2303.2026.02.04.

摘要

采用激光熔覆技术在12Cr1MoV钢表面制备Stellite 6合金熔覆层，并进行不同温度的退火热处理，研究其对熔覆层微观组织与性能的影响。结果表明，随着退火温度的升高，熔覆层的晶粒尺寸逐渐增大。低温退火对涂层的相组成影响不大，650 ℃×2 h退火处理时，FCC结构的γ-Co逐渐向稳定的HCP结构的ε-Co转变，并改善了熔覆层的组织均匀性和碳化物（Cr

、Cr

等）的分布。由于退火温度升高造成组织和碳化物析出相逐渐粗化，且加剧了基材中Fe元素向熔覆层中的扩散行为，从而导致熔覆层的硬度和耐磨性能随退火温度的升高而降低。650 ℃×2 h退火处理时的熔覆层自腐蚀电位最高（-0.284 V），自腐蚀电流密度最低（9.967×10

-7

A/cm

），耐腐蚀性能最佳，但过高的退火温度会造成熔覆层的耐腐蚀性能显著下降。

Abstract

Stellite 6 alloy coatings were fabricated on 12Cr1MoV steel via laser cladding and subsequently annealed at different temperatures to investigate the effects of annealing on their microstructure and properties. The results indicate that the grain size of the clad layer increases with rising annealing temperature. While low-temperature annealing (450 ℃) had little influence on the phase composition

annealing at 650 ℃ for 2 h promoted the transformation of the metastable FCC γ-Co phase into the stable HCP ε-Co phase

simultaneously improving microstructural homogeneity and the distribution of carbides (e.g.

). However

higher annealing temperatures led to coarsening of both the microstruc

ture and carbide precipitates

accompanied by enhanced diffusion of Fe from the substrate into the coating. Consequently

the hardness and wear resistance of the clad layer deteriorated with increasing annealing temperature. The coating annealed at 650 ℃ exhibited the best corrosion performance in 3.5 wt.% NaCl solution

reflected by the highest corrosion potential (-0.284 V) and the lowest corrosion current density (9.967×10⁻

A/cm

). Further increase in annealing temperature significantly degraded the corrosion resistance.

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references

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