梯度纳米结构 316L 不锈钢的马氏体不稳定性诱导表面硬化

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Vacuum Pub Date : 2024-11-14 DOI:10.1016/j.vacuum.2024.113831

Y.B. Lei , Z.M. Niu , B. Gao , Y.T. Sun

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引用次数: 0

摘要

通过表面机械轧制处理（SMRT）制造的梯度纳米结构（GNS）316L 不锈钢表面具有完整的马氏体相，表现出非凡的退火硬化性。经 SMRT 处理的 316L 不锈钢在 400 °C 退火 120 分钟后，表面硬度从 4.1 GPa 提高到 5.9 GPa，提高了 44%。表面硬化的主要原因是在原始纳米晶粒内形成了低角度晶界（LAGBs）。低角度晶界作为一种子结构，可有效地将晶粒分割成更小的单元。这些 LAGB 源于退火过程中镍偏析引起的晶格畸变。此外，镍的重新分布可被视为导致从马氏体到奥氏体相变的成核步骤。此外，分布在马氏体基体中的富镍区阻碍了位错运动，从而导致了观察到的表面硬化。

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Martensite instability induced surface hardening on gradient nano-structured 316L stainless steel

Gradient nanostructured (GNS) 316L stainless steel manufactured by surface mechanical rolling treatment (SMRT) with a full martensitic phase on the surface exhibits an extraordinary annealed hardening. The surface hardness increases by 44 % from 4.1 GPa of the SMRTed 316L stainless steel up to 5.9 GPa after annealed at 400 °C for 120 min. Surface hardening is primarily attributed to the formation of low angle grain boundaries (LAGBs) within the original nano-grains. LAGBs function as substructures that effectively divide the grains into smaller units. These LAGBs originate from lattice distortions caused by Ni segregation during the annealing process. Furthermore, the redistribution of Ni can be regarded as a nucleation step leading to phase reversion from martensite to austenite. Additionally, the presence of Ni-enriched zones distributed within the martensite matrix serves to hinder dislocation movement, thus contributing to the observed surface hardening.

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.