Deformation-induced phase transformation and strain hardening in type 304 austenitic stainless steel

Abstract

Deformation-induced phase transformation in atype 304 austenitic stainless steel has been studied in tension at room temperature and -50°C. The evolution of transformation products was monitored using X-ray diffraction (XRD) line profile analysis of diffraction peaks from as ingle XRD scan employing the direct comparison method. Crystallographic texture transitions due to deformation strain havebeen evaluated using (111) g pole figures. The tensile stress-strain data have been analyzed to explain the influence of underlying deformation-induced microstructural changes and associated texturechangesinthe steel. It is found that the initial stage of rapidlydecreasing strain hardeningrate in type 304 steel is primarily influenced by hcp e -martensite formation, and the seconds tage of increasing strain hardening rate is associated with an increasei nt he a # -martensite formation. The formation of e -martensite is associated with ag radual strengthening of the copper-type texture componentsupto15pct strain and decreasing with further strain at -50°C. Texture changes during low-temperature deformation not only change the mechanism of e -martensite formation but also influence the strain rate sensitivity of the present steel.

A constitutive model for analyzing martensite formation in austenitic steels deforming at high strain rates

“…If the number of related publications is taken into account (Iwamoto et al, 1998;Angel, 1954;De et al, 2006;Hecker et al, 1982;Mertinger et al, 2008;Tomita and Iwamoto, 1995;Tomita and Iwamoto, 2001), the AISI 304 can be considered to be the reference metastable austenitic stainless steel for studying the SIMT process. The AISI 304 belongs to the type called high alloy TRIP steels.…”

Deformation Mechanisms in Austenitic TRIP/TWIP Steel as a Function of Temperature

“…[9] The applicability of this approach was discussed in detail by Geissler et al [10] If the influence of temperature is discussed (Figure 1(c)), the main influence is attributed to DG cfie (Figure 1(b)), whereas the other contributions show only a negligible temperature dependence. [6] With a low SFE, special deformation mechanisms in the austenite are activated that involves SF formation, [11][12][13][14][15][16][17] namely single-slip e-martensite formation and twinning. The dissociation width (d s ) of partial dislocations depends mainly on the shear stress component on the glide plane s zx and the SFE (c SF ) according to Byun.…”

The effects of argon ion bombardment on the corrosion resistance of tantalum

“…In other words, ion implanters for surface modification of metals can be made a suitable substrate in different applications due to change of surface such as capacitors, resistors, and more recently as diffusion barriers in integrated circuits with copper interconnects [6][7][8][9], and polish stop in chemical mechanical polishing [10]. Other applications of Ta are in X-ray optics and in X-ray lithography as absorbers [11].…”