激光重熔处理对AZ31镁合金表面特性的影响

卫中山; 刘六法

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激光重熔处理对AZ31镁合金表面特性的影响
Effects of Laser Cladding Treatment on Surface Performance of AZ31 Magnesium Alloy
2011年31卷第6期页码：507-510
纸质出版日期： 2011 ，
DOI：

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[1]卫中山,刘六法.激光重熔处理对AZ31镁合金表面特性的影响[J].特种铸造及有色合金,2011,31(06):507-510.

Wei Zhongshan1, Liu Liufa2. Effects of Laser Cladding Treatment on Surface Performance of AZ31 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2011,31(6):507-510.
[1]卫中山,刘六法.激光重熔处理对AZ31镁合金表面特性的影响[J].特种铸造及有色合金,2011,31(06):507-510. DOI：

Wei Zhongshan1, Liu Liufa2. Effects of Laser Cladding Treatment on Surface Performance of AZ31 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2011,31(6):507-510. DOI：

摘要

使用Nd-YAG激光器对AZ31镁合金板材表面进行了激光重熔处理

分析了激光重熔处理对其表面特性的影响。在激光扫描时

试样表面发生了快速熔凝

处理层可分为重熔区、热影响区两部分。重熔区的晶粒得到明显细化

硬度比基体提高5%。腐蚀试验表明

AZ31镁合金在激光重熔处理后

在3.5%的NaCl溶液中的耐蚀性得到明显改善。重熔区晶粒细化和Al元素富集是激光重熔表面处理提高其耐蚀性的主要因素。

Abstract

Effects of laser cladding treatment on surface performance of AZ31 magnesium alloy sheet were observed by the help of Nd-YAG laser. Rapid melting-solidification occurs on the surface of the AZ31 magnesium alloy sheet

and treated surface is composed of re-melting zone and heat history zone. Grain size is apparently refined in the re-melting zone

and hardness is increased by 5% compared to that of the matrix. Immersing corrosion experiment shows that corrosion resistance of AZ31 magnesium alloy with laser cladding treatment is greatly improved in 3.5% NaCl solution

which is attributed to grain refinement in re-melting zone and enrichment of Al element in cladding surface.