The effect of preheat &amp; post weld heat treatment on the laser weldability of AISI 420 martensitic stainless steel

Köse, Ceyhun; Kaçar, Ramazan

doi:10.1016/j.matdes.2014.07.044

Cited by 73 publications

(22 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Laser welding differs from traditional welding methods on account of its lower heat input, higher condensation energy, faster welding speed, narrower weld zone, its ability to produce joints with deeper penetration, its higher mechanical strength, lower distortion, and its ability to weld without the use of additional metal [9][10][11][12][13][14][15][16]. Fiber laser welding machines have been used for decades.…”

Section: Introductionmentioning

confidence: 99%

Robotic Nd:YAG Fiber Laser Welding of Ti-6Al-4V Alloy

Köse

Karaca

2017

Metals

Self Cite

View full text Add to dashboard Cite

Abstract:In the present study, Ti6Al4V titanium alloy plates were joined using a robotic fiber laser welding method. The laser welding process was carried out at two different welding speeds. Effects of different heat input conditions on the microstructure and mechanical properties of robotic fiber laser welded joints were investigated. Some grain coarsening was observed in the microstructure of weld metal in samples joined using high heat input, compared to those using low heat input, and volume rates of primary α structures increased in the weld metal. The microstructure of weld metal in samples joined using low heat input was made of basket-weave or acicular α' grains and primary β grains in grain boundaries. Tensile and yield strength of samples joined using low heat input were higher than for those joined using high heat input, but their ductility was lower.

show abstract

Section: Introductionmentioning

confidence: 99%

Robotic Nd:YAG Fiber Laser Welding of Ti-6Al-4V Alloy

Köse

Karaca

2017

Metals

Self Cite

View full text Add to dashboard Cite

show abstract

“…Yüksek enerji yoğunluklu, ancak düşük ısı girdili yöntemlerle birleştirilen paslanmaz çeliklerde dar bir ITAB oluştuğu başka araştırmacılar tarafından da rapor edilmiştir [18][19][20][21][22].…”

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…The martensitic stainless steels are widely used in many industries because of their excellent mechanical properties and sufficient corrosion resistance. These steels are typically used in a wide range of applications, e.g., nuclear power plants, steam generators, mixer blades, pressure vessels, turbine blades, surgical tools, and instrument manufacturing [2]. A variety of experiments using martensite stainless steel have been conducted, for example AISI 410 were conventionally heat treated in diverse quenching environments to obtain three different microstructures: fine ferrite, fine and coarse martensite [3].…”

Section: Introductionmentioning

confidence: 99%

Preheating Temperature Effect on Crystal Structure and Texture of Martensitic Stainless Steel

Priyanto

Muslih

Mugirahardjo

et al. 2018

MST

View full text Add to dashboard Cite

Theoretically, the preheating temperature refers to the start martensite temperature (Ms), and the martensite transformation can be considered as the conservation of the invariant habit-plane in the lattice structure. The habit-plane is the interface plane between austenite and martensite as measured on a macroscopic scale. From the calculation, Ms = 252 °C. The martensite formation can be affected by temperature or stress treatment. In this experiment, temperature treatment was conducted. The sample was treated at 250 °C ± 10 °C. Before and after the pre-heat treatment, the sample was characterized using the neutron diffraction method. BATAN's Texture Diffractometer (DN2) with a neutron wavelength of 1.2799Å was used to characterize the sample. Analysis of the crystal structure showed that there are three phases before the preheating. The lattice parameters (a) obtained were as follows: for the -phase, a = 2.8501 ± 0.0004 Å; for the α'phase, a= b =2.517 ± 0.003 Å, and c= 3.581 ± 0.002 Å; for the -phase, a= 3.5884 ± 0.0004 Å, Rwp = 17.94%, and  = 1.33. After preheating, only the -phase appears with a = 3.5830 ± 0.0005 Å, Rwp = 26.03%, and  = 1.17. The orientation distribution function is modeled by the sample symmetrization model based on triclinic to orthorhombic sample symmetry. It shows that, before being preheated, the -phase has {100} <001> with texture index (F 2 ) between 0.701 m.r.d. to 3.650 m.r.d., the α-phase has a texture index between 0.923 m.r.d. to 1.768 m.r.d., and the '-phase has a texture index between 0.910 m.r.d. to 1.949 m.r.d. After being preheated, the -phase also has {100} <001> with a texture index between 0.846 m.r.d. to 3.706 m.r.d. It can be concluded, that because of the high preheating temperature, a phase change from martensite to austenite occurred that allowed the sample to be welded easily. After preheating, the -phase has the same cubic type orientation {100} <001>, and the texture index is nearly the same as that before preheating, with not martensite present. AbstrakPengaruh Suhu Pemanasan-Awal pada Struktur Kristal dan Tekstur Baja Tahan Karat Martensitik. Secara teoritis, suhu pemanasan awal mengacu pada suhu martensit awal (Ms), dan transformasi martensit dapat dianggap sebagai konservasi dari habit-plane invarian dalam struktur kisi. Habit-plane adalah bidang antarmuka antara austenit dan martensit yang diukur pada skala makroskopik. Dari perhitungan, Ms = 252 °C. Pembentukan martensit dapat dipengaruhi oleh suhu atau perlakuan tekanan. Dalam percobaan ini, perlakuan suhu dilakukan. Sampel diperlakukan pada 250 °C ± 10 °C. Sebelum dan sesudah perlakuan pemanasan-awal, sampel dikarakterisasi menggunakan metode difraksi neutron. Difraktometer Tekstur BATAN (DN2) dengan panjang gelombang neutron 1,2799 Å digunakan untuk mengkarakterisasi sampel. Analisis struktur kristal menunjukkan bahwa ada tiga fase sebelum pemanasan awal. Parameter kisi (a) yang diperoleh adalah sebagai berikut: untuk fasa-α, a = 2,8501 ± 0,0004 Å; untuk fasa-α', a = b = 2,517 ± 0,003 Å, dan c = ...

show abstract

The effect of preheat & post weld heat treatment on the laser weldability of AISI 420 martensitic stainless steel

Cited by 73 publications

References 15 publications

Robotic Nd:YAG Fiber Laser Welding of Ti-6Al-4V Alloy

Robotic Nd:YAG Fiber Laser Welding of Ti-6Al-4V Alloy

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

Preheating Temperature Effect on Crystal Structure and Texture of Martensitic Stainless Steel

Contact Info

Product

Resources

About