Effect of TIG welding on corrosion behavior of 316L stainless steel

Fathi, Mohammadhossein; Karimzadeh, F.; Dadfar, Mohammad Reza; Saatchi, A.

doi:10.1016/j.matlet.2006.09.008

Cited by 201 publications

(83 citation statements)

References 8 publications

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“…Kaynak metali mikroyapısının soğuma rejimine bağlı olarak ostenit matris içerisinde karıncalanma (vermicular), çatısal (skeletal), ve çıta (lath) tipi morfolojili delta ferrit fazlarından oluşur [10, 18,19,23]. Ostenit matris içerisinde %3-10 delta ferrit fazı bu çeliklerin katılaşma çatlamasına karşı direncini arttırır.…”

Section: Mikroyapı İncelemeleri (Microstructure Examination)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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Section: Mikroyapı İncelemeleri (Microstructure Examination)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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“…Some investigators have suggested [25,26,27] that while delta-ferrite increases during the welding process, many Crdepleted zones are probably formed because of microsegregation of Cr at the ferrite-austenite interphase boundaries and the interdendritics of ferrite are attacked by austennite due to the less stable passivity, leading to an increase of pitting corrosion susceptibility. However, in this study, as the low heat input and high cooling rate of the FCAW process did not offer sufficient time for chromium diffusion to microsegregate on the boundaries, a large quantity of chromium content may have still remained in the dendrite cores.…”

Section: Electrochemical Analysismentioning

confidence: 99%

Influences of Cr/Ni equivalent ratios of filler wires on pitting corrosion and ductility-dip cracking of AISI 316L weld metals

Kim

Sung

et al. 2011

Met. Mater. Int.

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To study the pitting corrosion of AISI 316L weld metals according to the chromium/nickel equivalent ratio (Creq/Nieq ratio), three filler wires were newly designed for the flux-cored arc welding process. The weld metal with delta-ferrite at less than 3 vol.%, was observed for ductility-dip cracking (DDC) in the reheated region after multi-pass welding. The tensile strength and yield strength increased with increasing Creq/Nieq ratio. The result of anodic polarization tests in a 0.1 M NaCl solution at the room temperature (25) for 45 min, revealed that the base metal and weld metals have a similar corrosion potential of −0.34 VSCE. The weld metal with the highest content of Cr had the highest pitting potential (0.39 VSCE) and the passivation range (0.64 VSCE) was higher than the base metal (0.21 VSCE and 0.46 VSCE, respectively). Adding 0.001M Na2S to the 0.1 M NaCl solution, the corrosion occurred more severely by H2S. The corrosion potentials of the base metal and three weld metals decreased to −1.0 VSCE. DDC caused the decrease of the pitting potential by inducing a locally intense corrosion attack around the crack openings.

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“…Therefore they are used in conditions that require high reliability and durability of the material. The protective ability is affected by metal microstructure, chemical composition (especially by the elements such as Cr, Mo, Ti, N) and also significantly by the surface treatment (Dadfar et al [3], Liptáková [5], Perren et al [7], Sedriks et al [9], SzklarskaSmialowska [10]). Mechanical surface treatments are commonly used in industries and believed to have better mechanical properties and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Surface treatment of the AISI 316L after welding and study of corrosion behaviour

Liptáková

Alaskari

Halamová

2013

Per. Pol. Transp. Eng.

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Effect of TIG welding on corrosion behavior of 316L stainless steel

Cited by 201 publications

References 8 publications

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

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

Influences of Cr/Ni equivalent ratios of filler wires on pitting corrosion and ductility-dip cracking of AISI 316L weld metals

Surface treatment of the AISI 316L after welding and study of corrosion behaviour

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