研究了 TC17 鈦合金電子束焊接接頭的顯微組織與力學性能. 研究表明, 焊接接頭由熔合區(FZ)、熱影響區(HAZ)和母材區(BM)組成. 焊態下, FZ 由 β 柱狀晶組成, HAZ 由針狀 α/α′相、等軸 α 相和亞穩態 β 相組成. 在 630~800 ℃范圍焊后熱處理后, FZ 和 HAZ 中的亞穩態 β 相分解, 生成 α 相和 β 相, 隨著焊后熱處理溫度的升高, FZ 和 HAZ 中的 α 相板條厚度增加, 晶界 α相發生粗化. 焊態和 800 ℃, 2 h, A.C.焊后熱處理條件下, FZ 在 450 ℃高溫拉伸過程中會析出次生 α 相板條, 導致熔合區抗拉強度升高, 屈強比降低. 焊接接頭的拉伸斷裂優先發生于屈服強度低的區域, 接頭各區域屈服強度相差不大時, 最終斷裂發生在硬度較低的區域. TC17 鈦合金電子束焊接接頭的最佳焊后熱處理制度為 630 ℃, 2 h, A.C., 此時焊接接頭具有良好的拉伸強度和塑性匹配.?
Most titanium alloys have been designed for aeronautical applications, where their?excellent specific properties are fully employed and weldability is a classic problem with Ti and?its alloys. Microstructure and mechanical properties of the electron beam weldments of TC17?alloy were investigated in this study. The results showed that there exhibited three zones across the?TC17 electron beam weldment: the fusion zone (FZ), heat affected zone (HAZ) and base metal?(BM). It was also observed that the as-welded FZ consisted of metastable β columnar grains,?while the HAZ consisted of acicular α/α′ phase, equiaxed α phase and metastable β phase.?Furthermore, it was indicated that the transformation from metastable β phase to α + β phase?happened when the FZ and HAZ were post-weld heat treated at 630~800 ℃, the coarsening of α?laths and the grain boundary α were also observed when the heat treatment temperature increased.?The increasing of 450 ℃?ultimate tensile strength of FZ was ascribed to the precipitation of?secondary acicular α platelets during tensile testing in the as-welded and 800 ℃?heat treated?conditions, which led to the low yield ratio of FZ. The tensile failure location of the weldments?was found to occur in preference in the low tensile yield strength area, or in the low hardness area?when the difference between yield strength across the weldments is very small. It was concluded?that the optimal post-weld heat treatment for the TC17 alloy weldment was 630 ℃, 2 h, A.C., at?which the weldments showed good combination of tensile strength and elongation.?
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