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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