Development of grain refining processes on nickel base alloy weld metals and elucidation of these mechanism

镍基合金焊缝金属晶粒细化工艺的发展及其机理的阐明

• 批准号: 19K05073
• 负责人: 西川 聡
• 金额: $ 2.75万
• 依托单位: Iwate University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2019
• 资助国家: 日本
• 起止时间: 2019-04-01 至 2021-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19K05073/
• 关键词: 結晶粒微細化; レーザー溶接; デンドライト; ニッケル基合金; 溶接金属; 核生成粒子; 固液共存温度範囲; 等軸晶; ニッケル基合金溶接金属; 欠陥検出性

溶接金属の結晶粒粗大化が問題になっているニッケル基600合金溶接金属について，①核生成粒子を添加し，②急熱・急冷が実現できるレーザー溶接を用いて結晶粒微細化を試みた．その結果，アルミナ+チタニア混合粉末を添加して溶接速度が一定の条件で溶接したときに最終凝固部で等軸晶が形成され，平均結晶粒数密度が増加した.これは，混合粉末により最終凝固部に粉末が凝集してデンドライト成長が阻害された結果，最終凝固部近傍でのデンドライトの枝分かれにより等軸晶的な組織を呈したと考えられた.

The problem of grain coarsening of welding metal is that the alloy base 600 dissolves the metal alloy, 1 nucleation particles are added, and 2 rapid cooling is used to show the microstructure of the solubilization. the results of grain refinement test show that the microstructure of the alloy is different from that of base 600 alloy. The melting speed of the mixed powder is determined under certain conditions, such as the formation of crystals such as the most solidified part, and the average grain number density increases slightly. The most effective solidification part of the mixed powder powder agglutination, the growth and the growth of the powder agglutinate the results of the test, and the microstructure of the crystal near the solidification part, such as the growth and growth of the powder, the microstructure of the crystal, such as the structure of the crystal.