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Influence of Deformation Heat Treatment on the Ultra-Fine Structure of Austenitic Stainless Steel

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Abstract:

According to accommodate-state and big bulk 18-8 type austenitic stainless steel has the weakness of coarse-grained and low strength. Optical microscopy，electron microscopy and X-ray diffraction were used to analyze microstructure and grain size of austenitic stainless steel specimens after deformation heat treatment. The paper investigates the influence of recrystallization annealing on the ultra-fine structure of cold deformation austenitic stainless steel. The results show that austenitic stainless steel can produce deformation-induced martensite by cold rolling deformation， and that the content of martensite increases with deformation degree. During the annealing, ultra-fine grains can be obtained by the reversal transformation-induced martensite(M′→ γ ). After severe cold deformation, inside austenitic grains imported austenitic-martensite(γ /M) phase boundaries shall serve to add a great deal of forming nucleus location for recrystallization, to enhance forming nucleus ratio and refine grain. 1Cr18Ni9Ti austenitic stainless steel by severe cold deformation and recrystallization annealing can acquire ultra-fine grains.

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Periodical:

Materials Science Forum (Volumes 551-552)

Pages:

421-425

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.551-552.421

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Online since:

July 2007

Authors:

Min Wang, Hong Zhen Guo

Keywords:

Austenitic Stainless Steel, Deformation-Induced-Martensite, Recrystallization, Reversal Transformation, Ultra-Fine Structure

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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