Hybrid Laser-arc Welding of 17-4 PH Martensitic Stainless Steel
| العنوان: | Hybrid Laser-arc Welding of 17-4 PH Martensitic Stainless Steel |
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| المؤلفون: | Raju Pillai, Wei Liu, Harold A. Sreshta, Biju Kumar, Radovan Kovacevic, M. Mazar Atabaki, Junjie Ma, Unnikrishnan Vasudevan |
| المصدر: | Lasers in Manufacturing and Materials Processing. 2:74-90 |
| بيانات النشر: | Springer Science and Business Media LLC, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Austenite, Nuclear and High Energy Physics, Materials science, Metallurgy, Weldability, Shielding gas, Welding, Martensitic stainless steel, engineering.material, Industrial and Manufacturing Engineering, law.invention, Corrosion, law, Modeling and Simulation, Ferrite (iron), engineering, Arc welding, Composite material, Instrumentation |
| الوصف: | PH stainless steel has wide applications in severe working conditions due to its combination of good corrosion resistance and high strength. The weldability of 17-4 PH stainless steel is challenging. In this work, hybrid laser-arc welding was developed to weld 17-4 PH stainless steel. This method was chosen based on its advantages, such as deep weld penetration, less filler materials, and high welding speed. The 17-4 PH stainless steel plates with a thickness of 19 mm were successfully welded in a single pass. During the hybrid welding, the 17-4 PH stainless steel was immensely susceptible to porosity and solidification cracking. The porosity was avoided by using nitrogen as the shielding gas. The nitrogen stabilized the keyhole and inhibited the formation of bubbles during welding. Solidification cracking easily occurred along the weld centerline at the root of the hybrid laser-arc welds. The microstructural evolution and the cracking susceptibility of 17-4 PH stainless steel were investigated to remove these centerline cracks. The results showed that the solidification mode of the material changed due to high cooling rate at the root of the weld. The rapid cooling rate caused the transformation from ferrite to austenite during the solidification stage. The solidification cracking was likely formed as a result of this cracking-susceptible microstructure and a high depth/width ratio that led to a high tensile stress concentration. Furthermore, the solidification cracking was prevented by preheating the base metal. It was found that the preheating slowed the cooling rate at the root of the weld, and the ferrite-to-austenite transformation during the solidification stage was suppressed. Delta ferrite formation was observed in the weld bead as well no solidification cracking occurred by optimizing the preheating temperature. |
| تدمد: | 2196-7237 2196-7229 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::f5ecaa5236256d4880913476d51fe4a7Test https://doi.org/10.1007/s40516-015-0007-2Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi...........f5ecaa5236256d4880913476d51fe4a7 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 21967237 21967229 |
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