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    N08825/L450QS鎳基復(fù)合板焊接工藝及組織性能研究

    Research on Welding Process,Microstructure and Properties of N08825/L450QS Nickel Base Clad Plate

    • 摘要: 通過合理的坡口設(shè)計(jì)，采用MAG+SAW+TIG焊接工藝對(duì)N08825/L450QS復(fù)合板進(jìn)行了板-板對(duì)接焊試驗(yàn)，并利用拉伸、導(dǎo)向彎曲、夏比沖擊、金相和腐蝕試驗(yàn)研究了該焊接接頭力學(xué)性能、塑韌性能、組織特征及抗腐蝕性能。試驗(yàn)結(jié)果表明：焊縫抗拉強(qiáng)度為615 MPa，-30℃下沖擊功值高達(dá)117 J且導(dǎo)向彎曲無裂紋；覆層熔敷區(qū)組織為奧氏體，中心呈等軸狀樹枝晶，邊緣為柱狀樹枝晶；焊縫晶間腐蝕平均速率為1.101 g/m2，點(diǎn)蝕平均速率為0.684 mm/a，基層焊縫HIC試驗(yàn)未發(fā)現(xiàn)裂紋；各項(xiàng)性能均滿足標(biāo)準(zhǔn)要求。

       

      Abstract: Based on the proper bevel design，the experimental plate-plate butt welding of the N08825/L450QS clad plate is conducted with the MAG+SAW+TIG welding process，and then the mechanical properties，plastic toughness，microstructure characteristics and corrosion resistance of the clad plate butt weld are investigated by means of tensile test，guided-bend test，V-notch Charpy impact test，metallographic test and corrosion test. The test results show that the tensile strength of the weld is 615 MPa，the impact toughness is up to 117 J at -30℃，and no crack is found after the guided-bend test；the microstructure of the clad layer deposited area is of austenite，the center area is of the equiaxed dendrites，and the edge is of columnar dendrites；the average rate of the weld intergranular corrosion is 1.101 g/m2，and the average rate of pitting corrosion is 0.684 mm/a；no crack is found via HIC test to the base layer weld. All the properties of the clad plate as welded are in compliance with applicable specification.

       

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