Combination of High Yield Strength and Improved Ductility of 21Cr Lean Duplex Stainless Steel by Tailoring Cold Deformation and Low-Temperature Short-Term Aging

doi:10.1007/s40195-023-01626-4

Abstract

Abstract:

Proper matching of cold-rolled deformation and low-temperature short-term aging can simultaneously enhance the strength and ductility of the lean duplex stainless steel. To investigate this, the microstructure evolution of cold-rolled and aging steels was observed by using scanning electron microscopy, transmission electron microscopy and electron backscattered diffraction. Additionally, the phase volume fraction was measured using X-ray diffraction. In this study, it was observed that the elongation of 21Cr lean duplex stainless steel significantly increased to 16.7% after undergoing moderate cold deformation (~ 40% reduction) and subsequent aging treatment at 550 °C for 30 min. Remarkably, the material still maintained a high yield strength of 1045 MPa. Such an excellent mechanical property was attributed to a unique microstructure combination of fine α'-martensite, twins, coarsened austenite resulting from partial martensite reverse transformation, and two-phase fine layered structure. The result of this study may open up new horizons for the alloy development in order to overcome the low ductility of cold-rolled high-strength lean duplex stainless steel.

Key words: Lean duplex stainless steel, Cold rolling, Aging, Microstructure, Mechanical properties, Use our pre-submission checklist

Zhenghong Liu, Zhigang Wu, Ying Han, Xiaolei Song, Guoqing Zu, Weiwei Zhu, Xu Ran. Combination of High Yield Strength and Improved Ductility of 21Cr Lean Duplex Stainless Steel by Tailoring Cold Deformation and Low-Temperature Short-Term Aging[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(4): 695-702.

Figures/Tables 6

Fig. 1 Representative engineering stress-strain curves of the samples according to the different treatments: a ST, CR40-30, and CR60-30. b and c Corresponding to tensile properties curves of CR40 and CR60 samples after cold rolling and aging treatment, respectively

Table 1 Tensile properties of different samples at room temperature

Samples	YS (MPa)	TS (MPa)	UE (%)	TE (%)
ST	554	779	30.4	40.4
CR40	1069	1195	1	9
CR40-5	1083	1177	2	13.7
CR40-30	1045	1170	5.7	16.7
CR60	1101	1270	0.8	8.2
CR60-5	1360	1433	1	10.7
CR60-30	1270	1360	1.9	10.7

Fig. 2 X-ray diffraction patterns of different samples

Fig. 3 Microstructures of the samples: a ST; b CR60; c CR60-30; d CR40; e CR40-5; f CR60-30; g-i CR40, CR40-5, and CR40-30 in the magnified area, respectively

Fig. 4 Microstructures of 21Cr LDSS as characterized by EBSD: a CR40; b CR40-30; c CR60; d CR60-5; e CR60-30

Fig. 5 Typical TEM micrographs of a-c CR40 samples and d-f CR60 samples following aging treatment at 550 °C with 30 min

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