Mechanical and Metallurgical Characterization of HSLA X70Welded Pipeline Steel Subjected to Successive Repairs

查看全文 作　　者：Bouzid [1,2]Maamache;Mabrouk [3]Bouabdallah;Abdelhalim [4]Brahimi;Youcef [1]Yahmi;Billel [1]Cheniti;Brahim [1,5]Mehdi

机构地区：[1]Research Center in Industrial Technologies(CRTI),P.O.Box 64,16014 Cheraga,Algeria;[2]Laboratoire des Aeronefs,Universite de Blidal,09000 Blida,Algeria;[3]LGSDS,Ecole Nationale Polytechnique,El Harrach,16200Algiers,Algeria;[4]LTSM,Universite de Blidal,09000 Blida,Algeria;[5]ICMMO/SP2M,Bat 410,Universite Paris-Sud 11,91405Orsay Cedex,France

出　　处：《Acta Metallurgica Sinica(English Letters)》索引2016年第29卷第6期,共9页

基　　金：the Research Center in Industria Technologies(CRTI)for its financial support;Mohamed Khider University,Biskra,for its help to accomplish this study 摘　　要：The aim of this work is to study the influence of successive weld repairs on the microstructure and the mechanical behavior of the heat-affected zone(HAZ) of an HSLA X70 steel. Detailed microstructural examination combined to grain size measurement showed that beyond the second weld repair, the microstructure of the HAZ undergoes significant change in the grain morphology and grain growth. The results of the X-ray diffraction analyzed using MAUD software indicated an increase in the crystallite size and a decrease in the dislocation density according to the number of weld repair operations. Consequently, a loss of mechanical properties, namely the yield strength and the toughness with the number of weld repairs, was recorded. Beyond the second weld repair operation, the properties of the welded joint do not fulfill the standards applied in piping industry. 关键词：HSLA X70 钢连续焊接修理热影响了地区脱臼密度

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Mechanical and Metallurgical Characterization of HSLA X70Welded Pipeline Steel Subjected to Successive Repairs

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