刘昊,虞钢,何秀丽,李少霞,朱天辉,宁伟健,郑彩云

• 1:中国科学院力学研究所先进制造工艺力学重点实验室
• 2:中国矿业大学机电工程学院

摘要(Abstract)：

针对铸铁激光熔覆涂层结合界面淬火硬化、裂纹倾向大的问题,提出激光合金化与激光熔覆相结合的工艺在蠕墨铸铁表面制备NiCoCrAlY合金涂层。通过光学显微镜、扫描电子显微镜、X射线衍射仪、维氏硬度计研究了激光合金化熔覆中熔覆层稀释率、组织、显微硬度的演化规律,通过三点弯曲试验考察了熔覆层的结合特性及力学性能。结果表明:激光合金化熔覆工艺方法将热影响区由马氏体组织转变为回火索氏体组织,降低了淬硬层深度,改善了熔覆层结合特性与塑性,抗弯强度提高到891MPa。断口显示,熔覆层与基体结合良好,断裂机制是脆性解理断裂与韧窝断裂混合机制。

关键词(KeyWords)： 蠕墨铸铁;激光熔覆;稀释率;显微组织;抗弯强度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(11272316,11272317);; 江苏高校优势学科建设工程资助项目

作者(Author): 刘昊,虞钢,何秀丽,李少霞,朱天辉,宁伟健,郑彩云

DOI: 10.13289/j.issn.1009-6264.2015.03.031

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