双重异质结构316L不锈钢的制备及力学性能研究

doi:10.11896/cldb.25040134

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Abstract A dual heterogeneous-structured 316L stainless steel with heterogeneous lamellar structure (HLS) and gradient structure (GS) was successfully fabricated through cold rolling-annealing (CR-A) and surface mechanical rolling treatment-annealing (SMRT-A) processes in this work, aiming to achieve an excellent strength-ductility balance. Microstructural characterization and mechanical property tests revealed that the CR-A treatment leads to the formation of a typical heterogeneous lamellar structure composed of ultrafine grains and coarse grains. Subsequent SMRT-A processing generates a gradient deformation layer approximately 450 μm thick on the material surface, exhibiting continuous gradient distributions in grain size, dislocation density, and recrystallization degree. Notably, the introduction of strain gradients significantly enhances the overall performance of the material. After heat treatment, the maximum microhardness of the sample reachs 5.4 GPa, representing a 125% improvement over the matrix, while achieving a yield strength of 889 MPa and a tensile strength of 1 008 MPa, and its elongation still maintaines at 20%. Analysis reveals that the heterogeneous laminated structure (HLS) plays a pivotal role in preserving overall plasticity through the plastic deformation capacity of coarse-grained regions. Meanwhile, the synergistic effects of multiple strengthening mechanisms introduced by the gradient structure (GS)-including grain refinement strengthening, back stress strengthening, and deformation-induced martensitic transformation-collectively enable the HLS-GS specimen to demonstrate exceptional strength-ductility synergy. This research provides new insights and experimental foundations for developing high-performance stainless steel materials.

Key words： 316L stainless steel cold rolling (CR) surface mechanical rolling treatment (SMRT) gradient structure (GS) heterogeneous lamellar structure (HLS)

Published: 25 April 2026 Online: 2026-05-06

CLC number:

TG142.1

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	Articles by authors
	HU Jian
	YU Yaoyao
	LIAO Jiangjie
	HUANG Hai
	QIU Jing

Cite this article:

HU Jian,YU Yaoyao,LIAO Jiangjie, et al. Study on the Fabrication and Mechanical Properties of Dual Heterogeneous Structured 316L Stainless Steel[J]. Materials Reports, 2026, 40(8): 25040134-6.

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https://www.mater-rep.com/EN/10.11896/cldb.25040134 OR https://www.mater-rep.com/EN/Y2026/V40/I8/25040134

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