發(fā)布時間：2018-12-21 13:14

【摘要】：研究激光沖擊處理(LSP)和固溶-時效兩種焊后處理工藝對7075鋁合金等離子弧焊接頭微觀組織和力學(xué)性能的影響規(guī)律。通過固溶-時效處理工藝優(yōu)化設(shè)計,確定焊接頭的最佳熱處理工藝為固溶(575℃,2 h)、時效(140℃,2 h),并與激光沖擊處理工藝進行了對比。結(jié)果表明:焊接頭經(jīng)2次激光沖擊后,表層焊縫區(qū)的顯微硬度提高23.3%,殘余應(yīng)力由拉應(yīng)力9 MPa變?yōu)閴簯?yīng)力23 MPa;在熱影響區(qū),顯微硬度提高44.4%,殘余應(yīng)力提高42.8%,抗拉強度達到607.89 MPa,與未處理樣品相比提高61.96%;固溶-時效在硬度的影響層深度、斷面收縮率方面優(yōu)于激光沖擊,而激光沖擊導(dǎo)致裂紋源萌生于次表層,提高了焊接頭的抗拉性能。
[Abstract]:The effect of laser shock treatment (LSP) and solids aging on the microstructure and mechanical properties of 7075 aluminum alloy plasma arc welding joint was studied. The optimum heat treatment process of welding joint was determined as solid solution (575 鈩，

本文編號：2388957