Pitting and galvanic corrosion behavior of laser-welded stainless steels

Kwok, Chi Tat; Fong, Simon; Cheng, F. T.; Man, Hau Chung

doi:10.1016/j.jmatprotec.2006.03.128

Cited by 120 publications

(33 citation statements)

References 22 publications

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“…Localized pit growth can be instrumental to damage and failure of engineering structures, as pits can be the origin of mechanical stress peaks that may induce severe crack formation. Related failure scenarios are reported for wide fields of engineering: Gas turbine blades have been reported to mechanically fail at regions attacked through pitting corrosion induced by sulfates from the combustion gas or by sodium or chlorine from sea air in marine environments [9,15,62]; pipelines and tubes have been reported to be severely damaged by the presence of sulphides [55] or chlorides [78], and/or through pitting corrosion induced by sea water-driven erosion of protective oxide covers [55]; marine immersion-induced pitting corrosion attacks may also be detrimental to ships, tanks, offshore platforms, and various types of containers (including nuclear ones) [53]; pitting corrosion has to be carefully considered in welding technology, where laser-welds typically show a less protective oxide layer than the virgin stainless steel materials [40], and in the development of orthodontic wires made of Nitinol, being subjected to the corrosion-favoring acidic environment provided by saliva [31,63]. On the civil engineering side, important infrastructure facilities such as concrete bridges or tunnel structures, both potentially steel-reinforced, may suffer durability problems due to corroding steel members [30,60,64].…”

Section: Introductionmentioning

confidence: 99%

Finite Volume model for diffusion- and activation-controlled pitting corrosion of stainless steel

Scheiner

Hellmich

2009

Computer Methods in Applied Mechanics and Engineering

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Section: Introductionmentioning

confidence: 99%

Finite Volume model for diffusion- and activation-controlled pitting corrosion of stainless steel

Scheiner

Hellmich

2009

Computer Methods in Applied Mechanics and Engineering

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“…Literatürde ince taneli kaynak metali sertlik artışının sebebi olarak verilmiştir [20,35]. Ancak, farklı kaynak ilerleme hızının birleştirmelerin kaynak metali ve ITAB sertlik dağılımında belirgin bir etkisi olmadığı bulunmuştur.…”

Section: Measurement Result)unclassified

Kaynak İlerleme Hizinin Aisi 316l Paslanmaz Çeli̇k Lazer Kaynakli Bi̇rleşti̇rmeleri̇ni̇n Mekani̇k Ve Mi̇kroyapi Özelli̇kleri̇ne Etki̇si̇

Köse¹,

Kaçar²

2015

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖZETBu çalışmada, AISI 316L (X2CrNiMo17-12-2) östenitik paslanmaz çelik levhalar CO 2 lazer ışını kaynak yöntemi ile birleştirilmiştir. Kaynak işlemi %50 Ar+%50 He gaz korumalı ortamda, 3500W lazer gücüyle ve 90-180-270 cm/dk farklı kaynak ilerleme hızlarında yapılmıştır. Numuneler otomatik olarak alın alına yatay pozisyonda ve ilave metal kullanılmadan birleştirilmiştir. Kaynaklı birleştirmelerin mekanik özelliklerini belirleyebilmek için çekme, çentik darbe ve üç nokta eğme testleri uygulanmıştır. İlave olarak kaynaklı bağlantıların sertlik ölçümü kaynak yönüne dik kesitten gerçekleştirilmiştir. Mikroyapı karakteristikleri ise Optik mikroskop, Taramalı Elektron Mikroskobu (SEM), Enerji Dağılımlı X-Işını Spektroskopisi (EDS), Elemental haritalama ve X-Işını Difraksiyonu (XRD) vasıtasıyla incelenmiştir. Yapılan bu araştırmanın sonucunda, lazer kaynak ilerleme hızının artmasıyla hızlı soğuma sonucunda mekanik özelliklerin iyileştiği ve kaynak metali mikroyapı morfolojisinin değiştiği tespit edilmiştir.Anahtar Kelimeler: Lazer ışın kaynağı, AISI 316L, kaynak ilerleme hızı, mekanik özellikler, mikroyapı EFFECT OF WELDING SPEED ON THE MECHANICAL PROPERTIES AND MICROSTRUCTURE OF LASER WELDED AISI 316L STAINLESS STEEL ABSTRACTIn this study, AISI 316L (X2CrNiMo17-12-2) austenitic stainless steel plates were joined with CO 2 Laser Beam Welding (LBW) method. The welding process were carried out in 50% Ar+50% He shielding gas atmosphere by using 3500W laser power for 90-180-270 cm/min different welding speeds. The samples were joined autogenously in butt welding position without using filler metal. In order to determine the mechanical properties of welded joints, the tensile, charpy impact and three point bending tests were applied. In addition, the hardness of the welded sample was measured on the cross section. The microstructure characterization of welded samples was carried out using with optical microscope, scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), elementel mapping and X-ray diffraction (XRD) analysis. As a result of this study, it was found that the mechanical properties of AISI 316L weldment recovered and the microstructure morphology of weld metal altered by increasing laser welding speed due to high cooling rate.

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“…Despite that fact that anticorrosive protection methods such as the paintings and electrochemical treatments are widely applied, the corrosion of the offshore structures is still unavoidable and severe. In the offshore structures, the weld joints are the most probable regions that are inclined to galvanic corrosion coupling with the base metal (BM) and the welded metals (WMs) [7,8]. erefore, the weld joints are of vital importance to the safety and lifetime of offshore structures in the industry.…”

Section: Introductionmentioning

confidence: 99%

Effects of Welding Heat Input on Microstructure and Electrochemical Behavior of Flux‐Cored Arc‐Welded Q690 HSLA Steel

Wang

Yi³

et al. 2018

Advances in Materials Science and Engineering

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In this work, the weld metal (WM) for the Q690 high-strength low-alloy (HSLA) steel was prepared through flux-cored arc welding (FCAW) at 10 kJ/cm and 20 kJ/cm heat inputs. e effect of welding heat input on the relationship between the microstructural factors and the electrochemical behavior of the FCAW Q690 steel was studied. Due to the fine grain and acicular ferrite affected by the 10 kJ/cm low heat input, the WM presented similar electrochemical behavior to the Q690 base metal, which would minimize the risk of galvanic corrosion. Also, at 20 kJ/cm of high welding heat input, the WM with higher-sized bainite structure was prone to galvanic corrosion risk minimization.

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Pitting and galvanic corrosion behavior of laser-welded stainless steels

Cited by 120 publications

References 22 publications

Finite Volume model for diffusion- and activation-controlled pitting corrosion of stainless steel

Finite Volume model for diffusion- and activation-controlled pitting corrosion of stainless steel

Kaynak İlerleme Hizinin Aisi 316l Paslanmaz Çeli̇k Lazer Kaynakli Bi̇rleşti̇rmeleri̇ni̇n Mekani̇k Ve Mi̇kroyapi Özelli̇kleri̇ne Etki̇si̇

Effects of Welding Heat Input on Microstructure and Electrochemical Behavior of Flux‐Cored Arc‐Welded Q690 HSLA Steel

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