...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of engineering materials and technology >The Rapid Cooling Effect on Microstructure of Nickel-Based Alloys Welding Joint
【24h】

The Rapid Cooling Effect on Microstructure of Nickel-Based Alloys Welding Joint

机译：快速冷却对镍基合金焊接接头组织的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Fusion welding of nickel-based alloys is often associated with coarse grains and severe segregation, which finally results in the increase of hot cracking susceptibility and poor mechanical properties. Conventional gas tungsten arc welding (GTAW) can aggravate these phenomena, which is mainly due to its high heat input and low cooling rate. In this paper, the cooling rate was enhanced by spraying liquid nitrogen during the welding process. Compared to conventional GTAW, the rapid cooling produced narrower heat affected zone (HAZ) width and more equiaxed grains in the fusion zone, thus higher hardness distribution was also achieved in this condition. In addition, gamma' phase exhibited a dispersed distribution, and segregation has been improved. The results show that the HAZ width is decreased by about 50%, and the fusion zone consisting of the finest equiaxed grains and the lowest segregation was obtained, when the heat sink located on one side 10 mm away from the weld centerline. Also, fine equiaxed grains and the dispersed distribution of gamma' phase could improve the grain boundary strength and reduce the incidence of liquid films along grain boundaries, contributing to prevent nickel-based alloys welding hot cracking from initiating.
机译：镍基合金的熔焊通常会导致晶粒粗大和严重偏析，最终导致热裂纹敏感性和机械性能下降。常规的钨极氩弧焊（GTAW）可以加剧这些现象，这主要是由于其高热量输入和低冷却速率。本文通过在焊接过程中喷入液氮来提高冷却速度。与常规GTAW相比，快速冷却在熔合区产生了更窄的热影响区（HAZ）宽度和更多等轴晶粒，因此在此条件下也获得了更高的硬度分布。另外，γ′相显示出分散的分布，并且偏析得到了改善。结果表明，当散热器位于距焊缝中心线10 mm的一侧时，热影响区宽度减小了约50％，并且获得了由等轴晶粒最细且偏析最低的熔合区。同样，细等轴晶和γ′相的分散分布可以提高晶界强度，并减少沿晶界的液膜发生率，有助于防止镍基合金发生热裂纹。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号