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研究了具有粗、细两种不同晶粒组织状态的MGH956合金板材室温～1200℃拉伸及1100℃持久性能。采用扫描电镜和金相显微镜对拉伸和持久试样的断口形貌及纵剖面组织进行了检验,对比分析了两种板材不同温度下的强化因素、及变形和断裂模式。结果表明:正是由于强化因素、及变形和断裂模式上的不同,使得细晶板材的拉伸强度在低温高于粗晶板材,在高温则低于粗晶板材,以及细晶板材的持久强度大大低于粗晶板材;但两种板材从室温～1200℃的拉伸伸长率并无明显差异。
MGH956 alloy sheet with two kinds of coarse and fine grain structure was studied at room temperature ~ 1200 ℃ tensile and 1100 ℃ long-term performance. The fracture appearance and longitudinal section of tensile and permanent specimens were examined by scanning electron microscopy (SEM) and optical microscope. The strengthening factors and deformation and fracture modes of the two kinds of slabs at different temperatures were compared and analyzed. The results show that the tensile strength of fine-grained sheet is higher than that of coarse-grained sheet at high temperature and lower than that of coarse-grained sheet and fine-grained sheet due to the strengthening factors and the different deformation and fracture modes. Greatly lower than the coarse grain plate; but the tensile elongation of the two plates from room temperature to 1200 ℃ no significant difference.