王建才

西安石油大學(xué)  機械工程學(xué)院  西安  710065

　　摘要：油井管在服役工況下，受到腐蝕性介質(zhì)，含CO2、H2S和Cl-,井下高溫、高壓環(huán)境的共同作用。油井管在井下的不可見性，使得油井管的破壞程度很難預(yù)測。一旦油井管發(fā)生破壞，就會造成整口井的報廢，造成很大的經(jīng)濟損失。本文首先介紹了疲勞裂紋的萌生和擴展發(fā)展現(xiàn)狀，再在腐蝕疲勞共同作用下，對油井管材料疲勞裂紋擴展進行研究。試驗采用三點彎曲法，在確定試樣尺寸后進行ANSYS應(yīng)力場模擬的基礎(chǔ)上，分別對比大氣環(huán)境和腐蝕介質(zhì)中疲勞裂紋擴展速率，采用掃描電鏡觀察產(chǎn)物膜形貌，研究腐蝕疲勞機理。結(jié)果表明，大氣環(huán)境下疲勞裂紋擴展速率受應(yīng)力大小的影響較大；而腐蝕介質(zhì)中，疲勞裂紋擴展受到應(yīng)力頻率、應(yīng)力比、介質(zhì)腐蝕性、電化學(xué)腐蝕的共同影響。

　　關(guān)鍵詞：電化學(xué)腐蝕腐蝕疲勞裂紋擴展

Fatigue Properties of OCTG Materials In Corrosive Environments

Wang  Jiancai

（ School of Mechanical Engineering , Xi'an Shiyou University, Xi'an 710065 ）

　　Abstract: OCTG subjects to corrosive media , including CO2, H2S and Cl-, downhole temperature, high pressure environment in service conditions. The extent of the damage is difficult to predict the oil well pipe because of OCTG invisible underground .Oil pipe failure occurs once , it will cause the entire scrap wells , causing great economic losses. This paper describes the status of fatigue crack initiation and expansion of development , and then in the joint corrosion fatigue effect on fatigue crack growth OCTG materials research . Using three-point bending test , the sample size in determining the basis for ANSYS stress field simulation, respectively, comparing the atmospheric environment and corrosive media fatigue crack growth rate , using scanning electron microscopy product film morphology and studying the mechanism of corrosion fatigue . The results show that atmospheric environmental fatigue crack growth rate greatly influenced by the size of the stress ; rather in corrosive media , the impact of fatigue crack growth under common stress frequency, stress ratio, medium corrosion , electrochemical corrosion.

　　Keywords : Electrochemical  Corrosion fatigue  Crack growth

　　聯(lián)系方式

　　王建才：wangjiancai90@126.com

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