Stress Relaxation Behavior of a Nb-Stabilized Austenitic Stainless Steel at 550 ℃

doi:10.1007/s40195-023-01611-x

Abstract

Abstract:

Stress relaxation resistance is one of the most significant properties that are critical to the service life of the fasteners. In this study, the stress relaxation behavior of a Nb-stabilized austenitic stainless steel was investigated. It was revealed that the homogenization treatment at 1250 ℃ could make more primary NbC particles dissolved back into the matrix and consequently get a great number of nano-sized secondary NbC carbides. Therefore, the stress relaxation resistance will be enhanced due to the effective pinning of such higher density of nano-sized secondary NbC carbides on the dislocation movement.

Key words: Nb-stabilized austenitic stainless steel, Homogenization treatment, Stress relaxation, NbC

Shuzhan Zhang, Xianbo Shi, Yuanfei Su, Wei Yan, Lijian Rong, Ke Yang. Stress Relaxation Behavior of a Nb-Stabilized Austenitic Stainless Steel at 550 ℃[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(12): 2079-2088.

Figures/Tables 13

Fig. 1 Schematic of heat treatment process

Fig. 2 Geometric dimensions of the stress relaxation test specimen (unit: mm)

Fig. 3 Engineering stress-strain curves of HFS and FS steels at 550 ℃

Fig. 4 SEM images a, b and corresponding EDS mapping of Nb c in the as-cast steel

Fig. 5 SEM images a, b and corresponding EDS mapping of Nb c in the homogenized steel

Fig. 6 Microstructure of HFS a-c and FS d-e steels after forging and solid solution treatment characterized by SEM a, b, d, e and OM c, f

Table 1 Statistics of average diameter and density of secondary NbC carbides in two steels

Steels	Average diameter of precipitates (nm)	Numbers of precipitates (μm⁻²)
HFS	121 ± 3.1	3.26 ± 0.24
FS	118 ± 2.5	1.45 ± 0.33

Fig. 7 Equilibrium solubility of [Nb] [C] in austenite

Fig. 8 Stress relaxations and corresponding fitting curves of HFS and FS steels

Fig. 9 EBSD band contrast images of HFS steel before a and after b stress relaxation

Fig. 10 Strain rate-stress curves of HFS and FS steels in stress relaxation at 550 ℃

Fig. 11 TEM images of precipitates and dislocations in the matrix of HFS steel

Fig. 12 Different morphologies of extended dislocations in FS a-c and HFS d-f steels observed on TEM

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