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首页> 外文期刊>Applied Surface Science >The comparative study of thermal fatigue behavior of laser deep penetration spot cladding coating and brush plating Ni-W-Co coating
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The comparative study of thermal fatigue behavior of laser deep penetration spot cladding coating and brush plating Ni-W-Co coating

机译：激光深熔点熔覆层与电刷镀Ni-W-Co涂层热疲劳行为的比较研究

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摘要

For improving the thermal fatigue behavior of hot work die steel in engineering application, the present work compare the influence of thermal fatigue resistance by the two different surface modified processes, the laser deep penetration spot cladding (LDPSC) and brush plating on the Cr12MoNi hot rolling tool steel. The thermal fatigue tests were fulfilled by heating and quenching in water at a cycle period of 2 min. Before and after thermal fatigue testing, the microhardness distribution profile and microstructure of LDPSC have been investigated. The results show that the LDPSC can be divided to three zones: cladding zone, alloying zone and heat affected zone. The major phases in cladding zone consist of Fe3C, Cr7C3, Cr23C6 and martensite. The oxidation resistance and thermal stability of brush plating Ni-W-Co coating and reference materials has been determined. The results of thermal fatigue testing show that LDPSC and brush plating Ni-W-Co coating can improve thermal fatigue resistance as compared to the reference material. The brush plating Ni-W-Co coating is more effective than the former owing to its higher thermal stability, oxidation resistance, superfine grain, high-density dislocation in microstructure and combination of strength and ductility. (c) 2006 Elsevier B.V. All rights reserved.
机译：为了改善工程应用中热作模具钢的热疲劳性能，本工作比较了Cr12MoNi热轧中两种不同的表面改性工艺，激光深熔点熔覆（LDPSC）和电刷镀层对耐热疲劳性的影响。工具钢。通过在水中以2分钟的周期加热和淬火来完成热疲劳测试。在热疲劳试验之前和之后，已经研究了LDPSC的显微硬度分布轮廓和显微组织。结果表明，LDPSC可以分为三个区域：熔覆区，合金化区和热影响区。熔覆区的主要相包括Fe3C，Cr7C3，Cr23C6和马氏体。确定了刷镀Ni-W-Co涂层和参考材料的抗氧化性和热稳定性。热疲劳测试的结果表明，与参考材料相比，LDPSC和电刷镀Ni-W-Co涂层可以提高抗热疲劳性。 Ni-W-Co刷涂镀层具有更高的热稳定性，抗氧化性，超细晶粒，微观结构中的高密度位错以及强度和延展性，因此比前者更有效。 （c）2006 Elsevier B.V.保留所有权利。

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