Dramatically enhanced impact toughness in welded ultra-ferritic stainless steel by additional nitrogen gas in Ar-based shielding gas
Source abstract
Abstract
The effect of nitrogen gas addition in Ar-based double-layer shielding gas on the impact toughness of welded ultra-ferritic stainless steel during an autogenous gas tungsten arc welding (GTAW) process was investigated. The nitrogen behavior was proposed. The microstructure, mechanical properties, and fracture surface morphology of the weld metals have been evaluated. More equiaxed crystals, refined grain, narrow HAZ width, and increased microhardness were produced with nitrogen addition. Experimental findings indicated that nitrogen diffused into HAZ and dissolved into weld pool. The solute distribution was changed thus bringing significant constitutional supercooling and decreased temperature gradient of weld pool, which contributed to fine microstructure. Impact toughness at room temperature was enhanced from 2J to 9J (welds), 5J–13J (HAZ). Ductile fracture zone was produced about 0.3–0.5 mm thickness distance from the weld surface. A significant increased impact toughness of weld metal was due to the refinement of microstructure and element addition.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Hydrogen embrittlement and corrosion behaviors in metals · Welding Techniques and Residual Stresses · Microstructure and Mechanical Properties of Steels
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (24)
Show source-provided references
1. Finite-element thermal analysis and grain growth behavior of HAZ on argon Tungsten-arc welding of 443 stainless steel
2. 10.1016/j.matlet.2016.04.00710.1016/j.matlet.2016.04.007 ↗
3. 10.1016/j.jmatprotec.2014.10.00410.1016/j.jmatprotec.2014.10.004 ↗
4. 10.1016/j.actamat.2015.07.01710.1016/j.actamat.2015.07.017 ↗
5. 10.1007/s10853-006-0498-510.1007/s10853-006-0498-5 ↗
6. 10.1016/j.jmatprotec.2010.05.01510.1016/j.jmatprotec.2010.05.015 ↗
7. 10.1016/S0921-5093(00)01821-910.1016/S0921-5093(00)01821-9 ↗
8. 10.1016/j.msea.2011.07.03510.1016/j.msea.2011.07.035 ↗
9. 10.1016/j.msea.2015.05.00610.1016/j.msea.2015.05.006 ↗
10. 10.1007/s00170-016-8693-210.1007/s00170-016-8693-2 ↗
11. 10.1016/j.matdes.2011.11.06310.1016/j.matdes.2011.11.063 ↗
12. 10.1016/j.matdes.2011.09.06610.1016/j.matdes.2011.09.066 ↗
13. 10.1016/j.matdes.2012.12.00810.1016/j.matdes.2012.12.008 ↗
14. 10.1016/j.jmatprotec.2016.01.01610.1016/j.jmatprotec.2016.01.016 ↗
15. The influence of nitrogen from welding on stainless-steel weld metal microstructures
16. Structure–property–fracture mechanism correlation in heat-affected zone of X100 ferrite−bainite pipeline steel
17. 10.1016/j.jallcom.2012.03.03010.1016/j.jallcom.2012.03.030 ↗
18. 10.1016/j.matdes.2008.10.02410.1016/j.matdes.2008.10.024 ↗
19. 10.1007/s11661-003-0010-710.1007/s11661-003-0010-7 ↗
20. 10.1016/j.mspro.2014.07.20410.1016/j.mspro.2014.07.204 ↗
21. 10.1016/j.matlet.2015.10.07110.1016/j.matlet.2015.10.071 ↗
22. 10.1016/j.matdes.2016.01.11110.1016/j.matdes.2016.01.111 ↗
23. 10.1016/S0921-5093(02)00377-510.1016/S0921-5093(02)00377-5 ↗
24. 10.2355/isijinternational.46.129210.2355/isijinternational.46.1292 ↗