Influence of tensile pre-strain on the low cycle fatigue and fracture behaviour of metastable duplex stainless steel

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2025-04-16 DOI:10.1016/j.engfailanal.2025.109610

Shuo Hao , Bin Pang , Zhenduo Sun , Miao Jin , Lei Chen , Kun Yang

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Abstract

In this work, influence of tensile pre-strain of 10 %∼30 % on the fatigue performance of a metastable duplex stainless steel (DSS) was studied at the strain amplitude of ε_a = 1.0 %. The variation of microstructures before cyclic deformation and after fatigue failure, as well as the damage and fracture features was analyzed through TEM, EBSD and SEM observations. The α’_bcc-martensite content was quantified by XRD analyses and Feritscope measurements. The results show that with increasing tensile pre-strain level (0 %≤ε_pre ≤ 30 %), a higher content of α’_bcc-martensite (from 0 % to 8.8 %) in austenite and a higher difference in the micro-hardness of austenite and ferrite (from 11 HV to 39 HV) are shown. During (subsequent) cyclic deformation, dislocation rearrangement and martensitic transformation occur in ferrite and austenite, respectively. Besides, the pre-strained specimens exhibit enhanced cyclic softening and improved fatigue life compared with the as-annealed specimen. The former is mainly due to the development of dislocation rearrangement with increasing pre-strain level, the latter is related to the role of deformation coordination and martensitic transformation in the nucleation and propagation of fatigue crack.

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拉伸预应变对亚稳态双相不锈钢低周疲劳及断裂行为的影响

本文研究了εa = 1.0 %应变幅时，10 %∼30 %的拉伸预应变对可蜕变双相不锈钢（DSS）疲劳性能的影响。通过 TEM、EBSD 和 SEM 观察分析了循环变形前和疲劳破坏后微观结构的变化以及损伤和断裂特征。通过 XRD 分析和 Feritscope 测量量化了 α'bcc- 马氏体含量。结果表明，随着拉伸预应变水平的增加（0 %≤εpre ≤ 30 %），奥氏体中的α'bcc-马氏体含量增加（从 0 % 到 8.8 %），奥氏体和铁素体的显微硬度差异增大（从 11 HV 到 39 HV）。在（随后的）循环变形过程中，铁素体和奥氏体分别发生了位错重排和马氏体转变。此外，与退火试样相比，预应变试样显示出更强的循环软化和更高的疲劳寿命。前者主要是由于位错重排随着预应变水平的增加而发展，后者则与变形协调和马氏体转变在疲劳裂纹的成核和扩展中的作用有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.