發(fā)布時(shí)間：2018-04-27 19:13

  本文選題：X管線鋼 + 高強(qiáng)度　； 參考：《焊接學(xué)報(bào)》2017年07期

【摘要】：采用力學(xué)測(cè)試、組織分析、掃描電鏡和能譜分析的方法,研究了X90高強(qiáng)度管線鋼預(yù)精焊的焊接裂紋形貌,并分析了裂紋形成原因.結(jié)果表明,X90螺旋焊鋼管內(nèi)焊縫上的橫向裂紋為冷裂紋,裂紋在焊縫組織中呈穿晶擴(kuò)展或沿晶界擴(kuò)展.X90含有較多的Mn,Cr,Mo,Ni,Cu等合金元素,強(qiáng)度高,導(dǎo)致內(nèi)焊縫的焊接殘余應(yīng)力高于裂紋的臨界應(yīng)力.內(nèi)焊道維氏硬度比外焊道的高,且焊縫兩側(cè)的硬度分布極不對(duì)稱,造成了內(nèi)焊道附近的應(yīng)力集中和分布不平衡.內(nèi)外焊縫重合區(qū)域的擴(kuò)散氫不易逸出,其含量較高,在氣孔、夾渣等"陷阱"處聚集,導(dǎo)致裂紋產(chǎn)生和斷口上大量氫白點(diǎn)形成.焊縫一次結(jié)晶所形成的連續(xù)細(xì)長(zhǎng)的樹枝晶晶界為裂紋擴(kuò)展提供了"通道".
[Abstract]:By means of mechanical test, microstructure analysis, scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS), the weld crack morphology of X90 high strength pipeline steel was studied, and the causes of crack formation were analyzed. The results show that the transverse crack in the weld of HX90 helical welded steel pipe is cold crack, and the crack is transgranular or propagate along grain boundary. X90 contains more alloy elements such as MnCrCrOMO-NiONI-Cu, and the strength of the crack is high. The welding residual stress of the inner weld is higher than the critical stress of the crack. The Vickers hardness of the inner weld is higher than that of the outer weld, and the hardness distribution on both sides of the weld is very asymmetric, which results in the stress concentration and distribution unbalance near the inner weld. The diffusion hydrogen in the overlap zone of internal and external welds is not easy to escape, and its content is high, which accumulates at the "traps" such as pores and slag, resulting in the formation of cracks and a large number of hydrogen white spots on the fracture surface. The continuous thin dendritic boundary formed by the primary crystallization of the weld provides a "channel" for crack growth.
【作者單位】： 中國(guó)石油集團(tuán)石油管工程技術(shù)研究院;
【基金】：陜西省自然科學(xué)基金資助項(xiàng)目(2011JQ6017)
【分類號(hào)】：TE973.3;TG441.7

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本文編號(hào)：1811961