Microstructure and properties of weld joint during 10 kW laser welding with surface-active element sulfur
| Autor: | Deng Hui, Shichun Li, Wei Xu, Zhaohui Deng |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
0209 industrial biotechnology Materials science Sulfide Metallurgy General Physics and Astronomy Laser beam welding chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry Welding 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Indentation hardness Sulfur Grain size Surfaces Coatings and Films law.invention Corrosion 020901 industrial engineering & automation chemistry law 0210 nano-technology |
| Zdroj: | Applied Surface Science. 426:704-713 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2017.07.262 |
| Popis: | The present work has been focused on the effects of surface-active element sulfur on welding properties during 10 kW high power laser welding of 304 stainless steel thick plate. Molten pool behavior, morphology feature of sulfide inclusions, metallographic structures, XRD patterns, microhardness, potentiodynamic polarization curves and pitted surface have been investigated and discussed. The results indicated that the added sulfur powder improved the weld depth by increasing molten metal fluidity, elongating molten pool and promoting heat transmission. The observed sulfide inclusions had small particle size of 0.65 μm in average and were distributed sparsely in weld joint. The WWS (weld joint with sulfur powder) had higher δ-ferrite content and finer grain size than the WWOS (weld joint without sulfur powder) and BM (base metal) due to the effects of sulfide inclusions on crystallizing process. The preferred orientations of γ-austenite along the (200) and (220) directions were promoted both in WWS and WWOS. Fine grain size and high δ-ferrite content led to high microhardness. The WWS had the highest microhardness among all the specimens. The WWOS and BM had a similar corrosion resistance. By comprehensive comparison, the WWS had a relative lower corrosion resistance than others, since sulfide inclusions in WWS not only had some benefits but also had some bad effects on corrosion property. |
| Databáze: | OpenAIRE |
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