Study on preparation and mechanism of high-strength-toughness niobium-containing duplex stainless steel: Synergistic annealing-induced TRIP and TWIP effects
IF 5.5 2区 材料科学Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
Pengcheng Wang, Lei Liu, Yongxu Gao, Xixiao Liu, Zhengzhi Zhao
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引用次数: 0
Abstract
To develop Lean duplex stainless steels (LDSS) with excellent strength-ductility balance and cost-effectiveness, a novel Mn-N-saving niobium-containing LDSS (Fe-0.03C-21Cr-5Mn-0.3 N-0.14Nb) was designed. The microstructural evolution and mechanical properties during annealing after heavy cold rolling were systematically investigated. Optimized annealing yielded an ultimate tensile strength (UTS) of ∼1 GPa and total elongation (TE) of ∼70 %. Mechanistic analysis revealed that this exceptional performance originates from unique phase transformation and recrystallization behaviors. Above the austenite transformation temperature, the martensite→ austenite reverse transformation was dominated by a shear mechanism, accompanied by abnormal thermal expansion along the rolling direction (RD). During annealing, recrystallization exhibited significant phase-dependent differences: Ferrite with high stacking fault energy (SFE) completed recrystallization at 800 °C, while austenite recrystallization was delayed until 850 °C due to suppressed recovery by low SFE. Strain hardening analysis indicated that shear-formed lath austenite contained high-density dislocations, enhancing stability but inhibiting transformation-induced plasticity (TRIP). As annealing temperature increased, austenite underwent recovery and recrystallization, reducing dislocation density and reactivating TRIP, thereby improving work hardening. Crucially, annealing at 950 °C elevated austenite SFE to a critical level, triggering synergistic TRIP and twinning-induced plasticity (TWIP) effects, ultimately imparting outstanding mechanical properties. This study provides new experimental insights and theoretical guidance for designing high-performance lean DSS.
期刊介绍:
Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials.
The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal.
The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include:
Metals & Alloys
Ceramics
Nanomaterials
Biomedical materials
Optical materials
Composites
Natural Materials.