研究了 TC17 鈦合金電子束焊接接頭的顯微組織與力學(xué)性能. 研究表明, 焊接接頭由熔合區(qū)(FZ)、熱影響區(qū)(HAZ)和母材區(qū)(BM)組成. 焊態(tài)下, FZ 由 β 柱狀晶組成, HAZ 由針狀 α/α′相、等軸 α 相和亞穩(wěn)態(tài) β 相組成. 在 630~800 ℃范圍焊后熱處理后, FZ 和 HAZ 中的亞穩(wěn)態(tài) 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(fā)生粗化. 焊態(tài)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(dǎo)致熔合區(qū)抗拉強(qiáng)度升高, 屈強(qiáng)比降低. 焊接接頭的拉伸斷裂優(yōu)先發(fā)生于屈服強(qiáng)度低的區(qū)域, 接頭各區(qū)域屈服強(qiáng)度相差不大時, 最終斷裂發(fā)生在硬度較低的區(qū)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(qiáng)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.?
作為值得信賴的合作伙伴和高品質(zhì)金屬合金的半成品供應(yīng)商，艾荔艾擁有完善的服務(wù)體系和專業(yè)的團(tuán)隊。在同客戶交易的過程中，我們力求根據(jù)不同的應(yīng)用需求將我們的產(chǎn)品做到精益求精。針對當(dāng)前和未來的市場需求，艾荔艾致力于為客戶提供最佳的金屬材料解決方案。
AILIAI has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. AILIAI develops the best alloy material solutions for current and future challenges.
獲取更多我們供應(yīng)的合金和服務(wù)信息，請致電086-021-67660801或發(fā)電子郵件[email protected]聯(lián)系我們，您也可以通過微博，微信，領(lǐng)英，XING，臉書和推特與我們互動。
For more information on the alloys and services that we supply,?call us?at 086-021-67660801 or email us at [email protected]. You can also get in touch on social media, we are constantly active on?Weibo,?Weixin,?LinkedIn,?XING, Facebook?and?Twitter.