Scholarlink

<p>A357.0 alloy was casted by using RheoMetal™ process, and then welded using laser deep penetration welding. After welding, the specimens were subjected to microstructural characterization and microhardness testing. The results indicate that a surface liquid segregation (SLS) layer enriched of alloying elements was formed on the surface, resulting in an increase in Si content in weld pool compared to that in the ingot. The microstructure of the weld pool is mainly composed of fine equiaxed and columnar crystals. A small amount of spherical α<sub>1</sub>-Al phases were found in the boundary of the weld pool. The eutectic region in the weld pool is mainly composed of Si phases, and small amount of MgSi, and AlFeMgSi phases. Compared to the matrix, the content of Mg and Fe in the weld pool has significantly decreased, which may be the result of burning loss of Mg and Fe under the high laser energy. The hardness testing of the samples in this study showed that the hardness of the heat affected zone (HAZ) was significantly higher than that of the weld pool and SLS layer. The hardness of equiaxed crystals in the weld pool is slightly higher than that of columnar crystals.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Microstructure and Hardness Analysis of Laser Welded A357 Semisolid Rheocasting Alloy

  • 期刊论文

  • 发表日期：

    2025年8月14日

查看全文
  • Baiwei Zhu,
  • Tianyu Zhu,
  • Jun Liu,
  • Bailiang Zhuang,
  • Hongwei Yuan,
  • Heyao Zhang,
  • Haijun Pan,
  • Erliang Liu

摘要

A357.0 alloy was casted by using RheoMetal™ process, and then welded using laser deep penetration welding. After welding, the specimens were subjected to microstructural characterization and microhardness testing. The results indicate that a surface liquid segregation (SLS) layer enriched of alloying elements was formed on the surface, resulting in an increase in Si content in weld pool compared to that in the ingot. The microstructure of the weld pool is mainly composed of fine equiaxed and columnar crystals. A small amount of spherical α1-Al phases were found in the boundary of the weld pool. The eutectic region in the weld pool is mainly composed of Si phases, and small amount of MgSi, and AlFeMgSi phases. Compared to the matrix, the content of Mg and Fe in the weld pool has significantly decreased, which may be the result of burning loss of Mg and Fe under the high laser energy. The hardness testing of the samples in this study showed that the hardness of the heat affected zone (HAZ) was significantly higher than that of the weld pool and SLS layer. The hardness of equiaxed crystals in the weld pool is slightly higher than that of columnar crystals.