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Dissimilar Laser Welding of High Strength Titanium Alloys
|Authors: ||Cheng-Yuan Chu|
|Contributors: ||NTOU:Institute of Materials Engineering|
|Issue Date: ||2011-11-23T03:13:08Z
|Abstract: ||研究中使用5KW二氧化碳雷射對Ti-6Al-4V、Ti-6Al-6V-2Sn鈦合金板材進行異種金屬全道熔融銲接，探討藉由異種銲接的方式使的銲道成份改變，與Ti-6Al-6V-2Sn銲件經不同銲後時效熱處理，對缺口拉伸強度的影響。 [Ti-6Al-4V] – [Ti-6Al-6V-2Sn]異種銲件及Ti-6Al-6V-2Sn銲件經不同時效熱處理，進行缺口拉伸實驗，實驗結果顯示，在482℃時效時銲件的融熔區域(Fusion Zone)與熱影響區(Heat Affect Zone)顯示有最高硬度，然而，銲件於704℃時效則有最低硬度。[Ti-6Al-4V] – [Ti-6Al-6V-2Sn]異種銲件及Ti-6Al-6V-2Sn銲件分別在482℃時效與593℃時效具有最低之缺口強度，之後隨時效溫度的提升，其缺口強度也隨之提高。[Ti-6Al-4V] – [Ti-6Al-6V-2Sn]銲件破斷微觀顯示，482℃時效銲件呈現寬廣的穿晶窩穴特徵，隨著溫度提升，破斷面呈現穿晶窩穴破壞伴隨著沿晶破壞現象也較明顯。|
CO2 laser welds were produced between Ti-6Al-4V and Ti-6Al-6V-2Sn sheet. Notched tensile strength (NTS) of the Ti-6Al-4V (Ti-6-4) to Ti-6A16V-2Sn (Ti-6-6-2) dissimilar welds were determined, which had been subjected to post-weld heat treatment (PWHT) over the temperature range of 482-704°C. The results indicated for the weld with the PWHT at 482°C the fusion zone (FZ) and heat-affected zone (HAZ) showed a peak hardness, as compared with other welds at the counterpart regions, whereas, the weld with the PWHT at 704°C had the lowest hardness among the welds. In all the welds, the FZ of the weld subjected to PWHT at 482oC possessed the lowest NTS, while the as-welded and the weld with PWHT at 704oC had superior NTS to others. The presence of grain boundary α, which promoted grain boundary shear, accounted for the typical features of mainly transgranular fracture with intergranular dimples of the welds.
|Appears in Collections:||[材料工程研究所] 博碩士論文|
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