L360QCS微合金鋼焊接接頭抗SSCC性能分析
本文關鍵詞: LQCS 焊接接頭 SSCC 微觀組織 腐蝕產物 出處:《材料導報》2017年S1期 論文類型:期刊論文
【摘要】:經過反復焊接工藝試驗,確定了合理的L360QCS微合金鋼焊接工藝參數,針對L360QCS微合金鋼焊接接頭進行了抗SSCC試驗研究。結果表明,焊接接頭屈服強度為410 MPa,抗拉強度為528 MPa,平均沖擊功值為145J,彎曲試驗、刻槽錘斷試驗均未見缺陷,各類力學性能指標合格;根焊層、填充層、蓋面層平均硬度值分別為136.6HV、146.3HV、157.1HV;根焊層、填充層微觀組織晶粒細小,為等軸鐵素體+珠光體蓋,蓋面焊層組織晶粒較粗大,為粒狀貝氏體+珠光體+針狀鐵素體;焊接接頭SSCC試驗未出現裂紋,經XRD、SEM分析,腐蝕產物膜為呈堆砌狀態(tài)的四方晶系晶體FeS。L360QCS微合金鋼焊接接頭能夠滿足NACE TM0177-2005標準規(guī)定的抗SSCC性能要求。
[Abstract]:After repeated welding experiments, reasonable welding parameters of L360QCS microalloyed steel were determined, and the SSCC resistance of the welded joints of L360QCS microalloyed steel was studied. The yield strength of welded joint is 410 MPA, the tensile strength is 528 MPA, the average impact work value is 145J, no defects are found in bending test and groove hammer breaking test, and all kinds of mechanical properties are up to standard. The average hardness of the caprock is 136.6 HVN 146.3 HVN 157.1 HV.The microstructure of the filler layer is fine, which is an equiaxed ferrite pearlite cover, and the microstructure of the cover welding layer is coarse, which is granular bainitic pearlite acicular ferrite. There were no cracks in the SSCC test of welded joints, and the corrosion product film was a stacked tetragonal crystal FeS.L360QCS microalloyed steel welded joint, which could meet the requirement of SSCC resistance stipulated by NACE TM0177-2005 standard.
【作者單位】: 西南石油大學應用技術學院;四川建筑職業(yè)技術學院材料工程系;
【基金】:西南石油大學自然科學基金(2012XJZ039) 南充市科技支撐項目(NC2015C045)
【分類號】:TG407
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