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(1 西安理工大學(xué)土木建筑工程學(xué)院， 西安 710048；2 西安理工大學(xué)水利水電學(xué)院， 西安 710048)

［摘要］為研究海洋環(huán)境腐蝕對高強(qiáng)鋼對接焊縫力學(xué)性能的影響，對不同銹蝕程度下的高強(qiáng)鋼對接焊縫連接進(jìn)行了微觀形貌掃描和靜力拉伸試驗(yàn)，分析了試件表面形貌與腐蝕時間的變化規(guī)律，建立了屈服強(qiáng)度、極限強(qiáng)度、彈性模量等力學(xué)參數(shù)的退化關(guān)系，基于二次塑流模型給出了不同腐蝕程度下高強(qiáng)鋼對接焊縫連接的本構(gòu)模型。結(jié)果表明：隨著腐蝕時間的增加，紅褐色腐蝕產(chǎn)物逐漸增多，試件的屈服強(qiáng)度、極限強(qiáng)度和彈性模量逐漸減小，延性降低；在腐蝕100d后，蝕坑深度達(dá)到440μm，彈性模量相對降低7.8%，屈服強(qiáng)度降低了8.28%；二次塑流模型能準(zhǔn)確模擬不同腐蝕程度下高強(qiáng)鋼對接焊縫連接的應(yīng)力-應(yīng)變關(guān)系，具有良好適用性。 

［關(guān)鍵詞］海洋腐蝕環(huán)境；鋼材銹蝕；高強(qiáng)鋼；對接焊縫連接；表面形貌；二次塑流模型 

中圖分類號：TU511-3 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)16-0076-05

Study on mechanical properties of  Q690 high-strength steel butt weld joint  in marine corrosive environment

GUO  Hongchao1,  ZHANG  Peng1,  LI  Tongyu2,  LI  Yanlong1,  LIU  Yunhe2 

(1 College of Civil Engineering, Xi’an University of Technology, Xi’an 710048， China；2 Water Resources and Hydropower Engineering, Xi’an University of Technology, Xi’an 710048， China) 

Abstract:To study the effect of marine environmental corrosion on the mechanical properties of high-strength steel butt weld joint, the micro-morphological scanning and static tensile tests of high-strength steel butt weld joints under different degrees of corrosion were carried out. The variation law of surface morphology and corrosion time of the specimen was analyzed, and the degradation relationship of mechanical parameters such as yield strength, ultimate strength and elastic modulus were established. Based on the secondary plastic flow model, the constitutive model of high-strength steel butt weld joint under different corrosion degrees was given. The results show that with the increase of corrosion time, the reddish-brown corrosion products gradually increase, and the yield strength, ultimate strength and elastic modulus of the specimens decrease gradually, and the ductility decreases. After 100 days of corrosion, the pit depth reached 440μm, the elastic modulus decreased by 7.8% relatively, and the yield strength decreased by 8.28%.The secondary plastic flow model can accurately simulate the stress-strain relationship of high-strength steel butt weld joints under different corrosion degrees, and has good applicability. 

Keywords:marine corrosive environment； steel corrosion； high-strength steel； butt weld joint； surface topography； secondary plastic flow model

*國家自然科學(xué)基金項(xiàng)目（51722907），陜西省科技廳自然科學(xué)基礎(chǔ)研究計(jì)劃項(xiàng)目（2018JM5006），陜西省教育廳重點(diǎn)實(shí)驗(yàn)室科學(xué)研究計(jì)劃項(xiàng)目（18JS072），鐵一院科學(xué)研究計(jì)劃項(xiàng)目（院科16-59-01）。

 作者簡介：郭宏超，博士，副教授，Emali：ghc-1209@163.com。