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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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b4c对mgh956合金tig焊接头性能的影响*
Keywords: 金属材料,mgh956合金,tig,原位合金化,b4c
Abstract:
？采用tig焊对mgh956合金进行原位合金化焊接,研究了b4c对焊缝显微组织和力学性能的影响。结果表明,填加b4c后焊缝以等轴晶为主,晶粒细小均匀,没有明显的氧化物聚集现象,晶内和晶界都有增强相;随着b4c含量的提高焊缝组织进一步细化,增强相几乎全部集中在晶界上,晶内颗粒状增强相消失。随着b4c含量的提高焊缝的塑韧性降低,抗拉强度先增大后降低。填加0.25%b4c时焊缝抗拉强度最高,达到630mpa,为母材强度的87.5%,断口呈脆性断裂。
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