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Dramatically enhanced impact toughness in welded ultra-ferritic stainless steel by additional nitrogen gas in Ar-based shielding gas

  • Heng Li (a1), Wenqing Xing (a1), Xinye Yu (a1), Wei Zuo (a1), Le Ma (a1), Peng Dong (a1), Wenxian Wang (a2), Guangwei Fan (a3), Jie Lian (a3) and Min Ding (a2)...

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.

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Corresponding author

a) Address all correspondence to this author. e-mail: dingmin@tyut.edu.cn

References

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1. Wang, Y.C., Ding, M., Zheng, Y., Liu, S.S., Wang, W.X., and Zhang, Z.H.: Finite-element thermal analysis and grain growth behavior of HAZ on argon Tungsten-arc welding of 443 stainless steel. Met.-Open. Acc. Met. J. 6, 4 (2016).
2. Zheng, Y., Wang, Y.C., Li, H., Xing, W.Q., Yu, X.Y., Dong, P., Wang, W.X., Fan, G.W., Lian, J., and Ding, M.: An experimental study of nitrogen gas influence on the 443 ferritic stainless steel joints by double-shielded welding. Int. J. Adv. Manuf. Technol. (2016), doi: 10.1007/s00170-016-8693-2.
3. Amuda, M.O.H. and Mridha, S.: Comparative evaluation of grain refinement in AISI 430 FSS welds by elemental metal powder addition and cryogenic cooling. Mater. Des. 35, 609 (2012).
4. Mallaiah, G., Reddy, P.R., and Kumar, A.: Influence of titanium addition on mechanical properties. Residual stresses and corrosion behaviour of AISI 430 grade ferritic stainless steel GTA welds. Proc. Mater. Sci. 6, 1740 (2014).
5. Watanabe, T., Shiroki, M., Yanagisawa, A., and Sasaki, T.: Improvement of mechanical properties of ferritic stainless steel weld metal by ultrasonic vibration. J. Mater. Process. Technol. 210, 1646 (2010).
6. Mallaiah, G., Kumar, A., Reddy, P.R., and Reddy, G.M.: Influence of grain refining elements on mechanical properties of AISI 430 ferritic stainless steel weldments—Taguchi approach. Mater. Des. 36, 443 (2012).
7. Amuda, M.O.H. and Mridha, S.: Grain refinement and hardness distribution in cryogenically cooled ferritic stainless steel welds. Mater. Des. 47, 365 (2013).
8. Watanabe, Y., Takeda, T., and Sato, H.: Effect of magnetic field on weld zone by spotwelding in stainless steel. ISIJ Int. 46, 1292 (2006).
9. Zhu, Z.X., Han, J., Li, H.J., and Lu, C.: High temperature processed high Nb X80 steel with excellent heat-affected zone toughness. Mater. Lett. 163, 171 (2016).
10. Li, J.Y., Chen, Y.L., and Huo, J.H.: Mechanism of improvement on strength and toughness of H13 die steel by nitrogen. Mater. Sci. Eng., A 640, 16 (2015).
11. Okagawa, R.K., Dixon, R.D., and Olson, D.L.: The influence of nitrogen from welding on stainless-steel weld metal microstructures. Weld. J. 62, S204 (1983).
12. Shi, Z.R., Wang, R.Z., Su, H., Chai, F., Wang, Q.F., and Yang, C.F.: Effect of nitrogen content on the second phase particles in V–Ti microalloyed shipbuilding steel during weld thermal cycling. Mater. Des. 96, 241 (2016).
13. Bang, K.S., Chan, P., and Liu, S.: Effects of nitrogen content and weld cooling time on the simulated heat-affected zone toughness in a Ti-containing steel. J. Mater. Sci. 41, 5994 (2006).
14. Lai, R., Cai, Y., Wu, Y., Li, F., and Hua, X.: Influence of absorbed nitrogen on microstructure and corrosion resistance of 2205 duplex stainless steel joint processed by fiber laser welding. J. Mater. Process. Technol. 231, 397 (2016).
15. Keskitalo, M., Mäntyjärvi, K., Sundqvist, J., Poweel, J., and Kaplan, A.F.H.: Laser welding of duplex stainless steel with nitrogen as shielding gas. J. Mater. Process. Technol. 216, 381 (2015).
16. Huang, H.Y.: Effects of shielding gas composition and activating flux on GTAW weldments. Mater. Des. 30, 2404 (2009).
17. Lin, Y.C. and Chen, P.Y.: Effect of nitrogen content and retained ferrite on the residual stress in austenitic stainless steel weldments. Mater. Sci. Eng., A 307, 165 (2001).
18. Shankar, V., Gill, T.P.S., Mannan, S.L., and Sundaresan, S.: Effect of nitrogen addition on microstructure and fusion zone cracking in type 316L stainless steel weld metals. Mater. Sci. Eng., A 343, 170 (2003).
19. Akhlaghi, M., Steiner, T., Meka, S.R., Leineweber, A., and Mittemeijer, E.J.: Lattice-parameter change induced by accommodation of precipitate/matrix misfit; misfitting nitrides in ferrite. Acta Mater. 98, 254 (2015).
20. Fattahi, M., Nabhani, N., Vaezi, M.R., and Rahimi, E.: Improvement of impact toughness of AWS E6010 weld metal by adding TiO2, nanoparticles to the electrode coating. Mater. Sci. Eng., A 528, 8031 (2011).
21. Díaz-Fuentes, M., Iza-Mendia, A., and Gutiérrez, I.: Analysis of different acicular ferrite microstructures in low-carbon steels by electron backscattered diffraction. Study of their toughness behavior. Metall. Mater. Trans. A 34, 2505 (2003).
22. Li, X., Ma, X., Subramanian, S.V., Misra, R.D.K., and Shang, C.: Structure–property–fracture mechanism correlation in heat-affected zone of X100 ferrite−bainite pipeline steel. Metall. Mater. Trans. E 2, 1 (2015).
23. Kang, J., Li, C.N., Yuan, G., and Wang, G.D.: Improvement of strength and toughness for hot rolled low-carbon bainitic steel via grain refinement and crystallographic texture. Mater. Lett. 175, 157 (2016).
24. Kaijalainen, A.J., Suikkanen, P.P., Limnell, T.J., Karjalainen, L.P., Kömi, J.I., and Porter, D.A.: Effect of austenite grain structure on the strength and toughness of direct-quenched martensite. J. Alloy. Compd. 577, S642 (2013).

Keywords

Dramatically enhanced impact toughness in welded ultra-ferritic stainless steel by additional nitrogen gas in Ar-based shielding gas

  • Heng Li (a1), Wenqing Xing (a1), Xinye Yu (a1), Wei Zuo (a1), Le Ma (a1), Peng Dong (a1), Wenxian Wang (a2), Guangwei Fan (a3), Jie Lian (a3) and Min Ding (a2)...

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