| METALS AND METAL MATRIX COMPOSITES |
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| Effects of Deep Cryogenic and Aging Treatments on Microstructural Evolution and Properties of Cold-deformed 0Cr21Mn18Mo1.8N0.8 High-nitrogen Alloy Steel |
| XIONG Qihang1,2, LI Mingyu1,2, CAI Yonghe3, LIANG Yuan4, GAO Yuan4, ZHU Weiwei1,2, ZHAO Yu1,2, ZU Guoqing1,2,*
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1 School of Materials Science and Engineering, Changchun University of Technology, Changchun 130052, China
2 Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun 130052, China
3 Jilin Yuanfang Machinery Group Co., Ltd., Huadian 132499, Jilin, China
4 Jilin Jianlong Steel Co., Ltd., Jilin 132301, Jilin, China |
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Abstract Deep cryogenic treatment (DCT)can enhance the strength of metallic materials, however, it induces significant ductility loss of metallic mate-rials, especially high-nitrogen alloy steel (HNAS). This work addresses this limitation by applying a combined processing route comprising 4 h DCT followed by short-term intermediate-temperature aging at 580 ℃ for 30 min to cold-deformed 0Cr21Mn18Mo1.8N0.8 high-nitrogen steel. This approach simultaneously achieves enhanced strength and retained ductility, yielding an ultimate tensile strength (UTS) of 1 624 MPa, a microhardness of 490HV, an elongation of 20.2%, and a strength-ductility product of 32.8 GPa%. Microstructural analysis reveals that DCT promotes the formation of subgrains, deformation twins, and low-angle grain boundaries, leading to grain refinement and a substantial increase in dislocation density. These modifications elevate the UTS from 1 413 MPa to 1 594 MPa while concurrently triggering quasi-cleavage fracture behavior, reducing uniform elongation to 9.6%. Subsequent aging treatment restores plasticity via dislocation rearrangement, substructure optimization, and local stress relaxation. Critically, the proposed recovery mechanism preserves beneficial dislocation density while maintaining its UTS. The superior mechanical properties are attributed to the synergistic effects of work hardening, dislocation strengthening, grain refinement streng-thening, and grain boundary strengthening. Collectively, the DCT-aging sequence after cold deformation effectively mitigates the strength-ductility trade-off in HNAS samples.
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Published: 10 August 2026
Online: 2026-08-31
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2026, Vol. 40 
