Cu-rich nanoprecipitates modified using Al to simultaneously enhance the strength and ductility of ferritic stainless steel

doi:10.1016/j.jmst.2021.12.061

Abstract

Abstract:

In the present work, we obtained coherent Cu-rich nanoprecipitates containing high-density dislocations by adding Al to Cu-bearing ferritic stainless steel after short-term aging. Such Cu-rich nanoprecipitates were rich in Al and had finer particle size and higher number density. Moreover, the high-density dislocations in the Cu-rich nanoprecipitates were capable of delaying the occurrence of plastic instability. Thus, the strength and ductility of Cu-bearing ferritic stainless steel were simultaneously improved.

Key words: Nanoprecipitates, Short-term aging, Precipitation strengthening, Mechanical properties, Ferritic stainless steel

Mingkun Jiang, Ying Han, Xiangyi Chen, Guoqing Zu, Weiwei Zhu, Xu Ran. Cu-rich nanoprecipitates modified using Al to simultaneously enhance the strength and ductility of ferritic stainless steel[J]. J. Mater. Sci. Technol., 2022, 121: 93-98.

Figures/Tables 6

Table 1. Chemical compositions of the experimental steel (wt.%).

Empty Cell	C	Cr	Mn	Si	Ni	Nb	Ti	Cu	Al
1#	0.0054	17.90	0.20	0.80	0.99	0.39	0.20	1.48
2#	0.0054	18.00	0.21	0.80	1.01	0.40	0.20	1.48	1.01

Fig. 1. Mechanical properties of the various samples, including (a) engineering stress-strain curves; plots of strain hardening rate (ɵ) vs (b) net flow stress and (c) true strain; and the tensile fracture morphologies of samples (d) 1#A and (e) 2#A.

Fig. 2. OM images of samples (a) 1#S and (c) 2#S; distributions of Cu-rich phases in samples (b) 1#A and (d) 2#A; and TEM images of the Nb-rich phases in samples (e) 1#A and (f) 2#A before deformation.

Fig. 3. High-magnification TEM images, fast Fourier transform (FFT), and EDS results of the Cu-rich nanoprecipitates in samples (a) 1#A and (c) 2#A; (b1) high-resolution transmission electron microscopy (HRTEM) image and (b2) IFFT pattern of BCC-Cu in sample 1#A; and (d1) HRTEM image and (d2) IFFT pattern of BCC-Cu in sample 2#A; (b3) and (d3) are GPA plots for the lattice strains in the positive x-direction (εxx), corresponding to (b2) and (d2), respectively. (The compressive strain to tensile strain is depicted by the color from blue to red.).

Fig. 4. TEM images showing the microstructures of samples (a) 1#A and (c) 2#A after deformation; FFT patterns of the (b1) Cu-rich nanoprecipitates and (b3) matrix, HRTEM images of (b2) BCC-Cu and (b4) B2-Cu in sample 1#A; FFT patterns of (d1) BCC-Cu and (d3) the matrix, and IFFT patterns of (d2) BCC-Cu and (d4) the matrix in sample 2#A.

Table 2. Strengthening coefficients for alloying elements in the α-Fe matrix at room temperature (MPa/at.%) [58], [59], [60].

C	Cr	Mn	Si	Ni	Nb	Ti	Cu	Al
1103	2.6	16.9	42	0.5	16	18	57	16.6

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