He Haotao,Wang Chen,Li Jinhui,et al.Study on laser surface modification of AZ91 magnesium alloy for automobile[J].Plating & Finishing,2023,(5):41-50.[doi:10.3969/j.issn.1001-3849.2023.05.006]
汽车用AZ91镁合金的表面激光改性研究
- Title:
- Study on laser surface modification of AZ91 magnesium alloy for automobile
- Keywords:
- laser cladding ; laser power ; scanning speed ; wear volume ; corrosion resistance
- 分类号:
- TG174.4
- 文献标志码:
- A
- 摘要:
- 为了解决压铸 AZ91 镁合金耐蚀和耐磨性能较差的问题，采用激光熔覆的方法在汽车用压铸 AZ91 镁合金表面制备了激光熔覆层，研究了激光功率和激光扫描速度对熔覆层成型、截面和表面形貌、物相组成、耐蚀和耐磨性能的影响。结果表明，过小 / 过大激光功率或者过大扫描速度会使得熔覆层中产生气孔、熔坑等缺陷；不同激光功率和扫描速度下，熔覆层与 AZ91 镁合金基体结合良好， AZ91 镁合金表面激光熔覆层都主要由 α -Mg 、 Mg 17 Al 12 、 AlCu 4 、 Al 4 MgY 和 MgAl 相组成；随着激光功率增加，熔覆层表面晶界间距离和晶粒尺寸增大，熔覆层平均维氏硬度会逐渐减小；随着激光扫描速度增加，熔覆层厚度和熔覆层晶粒尺寸逐渐减小。激光熔覆层的耐蚀性和耐磨性都优于 AZ91 镁合金基体， Al-Cu/Y 2 O 3 熔覆层适宜的激光熔覆工艺为：激光功率 1100 W 、扫描速度 500 mm/min ，此时激光熔覆层与基体结合良好，熔覆层致密、晶粒细小、硬度较高，具有良好的耐蚀性和耐磨性。
- Abstract:
- ： In order to solve the problem of poor corrosion resistance and wear resistance of die cast AZ91 magnesium alloy ， the laser cladding layer was prepared on the surface of die casting AZ91 magnesium alloy for automobile by laser cladding ， the effects of laser power and laser scanning speed on the formation ， cross section and surface morphology ， phase composition ， corrosion resistance and wear resistance of the cladding layer were studied. The results showed that ， too small / too large laser power or too high scanning speed will cause defects such as pores and craters in the cladding layer ； under different laser power and scanning speed ， the cladding layer and AZ91 magnesium alloy substrate are well bonded. The laser cladding layer on the surface of AZ91 magnesium alloy is mainly composed of α -Mg ， Mg 17 Al 12 ， AlCu 4 ， Al 4 MgY and MgAl ； with the increase of laser power ， the distance between grain boundaries and grain size on the surface of cladding layer increase ， and the average hardness of cladding layer decreases gradually ； with the increase of laser scanning speed ， the thickness and grain size of cladding layer decrease gradually. The corrosion resistance and wear resistance of the laser clad ding layer are better than these of AZ91 magnesium alloy substrate. The suitable laser cladding process for Al-Cu/Y 2 O 3 cladding layer is ： laser power 1100 W ， scanning speed 500 mm/min ， while the laser cladding layer and the substrate are well combined ， the cladding layer is dense ， fine grain ， high hardness ， and has good corrosion resistance and wear resistance.
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备注/Memo
收稿日期： 2022-09-01 修回日期： 2022-11-29 作者简介： 和豪涛（ 1982- ），男，硕士，副教授，研究方向；汽车材料、表面工程等， email ： hnjyhe@163.com 基金项目： 河南省科技攻关计划项目（ 182102210296 ）?/html>