Investigation on Effect of Solution-Stabilizing Post Heat Treatment on Microstructure of AISI321 Stainless Steel


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In this investigation, AISI321 steel was solution - stabilizing post heat treated in various temperatures and times after SMAW welding. Results show, increasing of temperature in solution and stabilizing heat treatment, raise sensitization; in addition, by increasing of the solution heat treatment time, sensitization enhances. However, increasing the time of stabilizing heat treatment creates less chrome carbides, so the sensitization decreases. These heat treatments reduce the amount of delta ferrite and change its morphology from narrow and acicular shape to discontinues and separate globular particles. Moreover, more carbide and carbonitrid of Ti and Nb are also created.



Materials Science Forum (Volumes 773-774)

Edited by:

A. Kiet Tieu, Hongtao Zhu and Qiang Zhu




A. Mahmoudi et al., "Investigation on Effect of Solution-Stabilizing Post Heat Treatment on Microstructure of AISI321 Stainless Steel", Materials Science Forum, Vols. 773-774, pp. 785-794, 2014

Online since:

November 2013




[1] M.G. Fontana, Corrosion engineering, third ed., McGraw-Hill, New York, 1995, pp.100-118.

[2] A. Pardo, M.C. Merino, Influence of Ti, C and N concentration on the intergranular corrosion behavior of AISI 316 and 321 stainless steels, Acta. Mater. (2007).

[3] F. liu, Y. Hwang, The effect of post weld heat treatment on the creep-fatigue behavior of gas tungsten arc welded 308L stainless steel, Mater. Sci. Eng. (2006) 427-35.


[4] M. Schwind, J. Kallqvist, σ phase precipitation in stabilized austenitic stainless steels, Acta. Mater. 48 (2000) 24-73.

[5] C. lippold, J. Ktecki, Welding metallurgy and weld ability of stainless steel, (2005).

[6] J. Davis, stainless steels, ASM Specialty Handbook, Metals Park, 1996, p.280.

[7] Standard practices for detecting to intergranular attack in austenitic stainless steels, ASTM, A, 1989, pp.262-86.

[8] A. Yae Kina, V.M. Souza, Influence of heat treatment on the intergranular corrosion resistance of the AISI 347 cast and weld metal for high temperature service, Mater. Pro. Tech. (2007).


[9] G. Silva, A. Souza, Microstructural and electrochemical characterization of the low temperature sensitization of AISI 321stainless steel tube used in petroleum refining plants, mater. Sci. (2003).

[10] J. Lancaster, Metallurgy of welding, sixth ed., Abington Publishing, 1999, p.211.

[11] K. Guan, X. Xu, Effect of aging at 700oC on precipitation and toughness of AISI 321and AISI 347 austenitic stainless steel welds, Nuclear Engineering and Design, 235 (2005) 24-85.