Effect of Surface Roughness on Fatigue Strength in Martensitic Stainless Steel

IF 1.9 4区工程技术 Q2 Engineering

International Journal of Precision Engineering and Manufacturing Pub Date : 2024-08-01 DOI:10.1007/s12541-024-01079-4

Dong-Su Bae, Jin-Kyung Lee

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Abstract

This research was performed to study the effect of surface roughness on the fatigue limit in martensitic stainless steel (STS 410). After heat treatment of STS 410 steel, mechanical property tests and rotary bending fatigue tests were performed by varying the surface roughness conditions of A-polishing, A-grinding, and A-#60 of STS 410 steel, respectively. The fatigue fracture surface was observed and analyzed using SEM and EDS. The fatigue limit of STS 410 steel decreased by 0.98% from 509 to 504 MPa when the surface roughness increased about 3 times from 0.226 to 0.664 μm. However, when it increased about 9 times from 0.226 to 2.053 μm, it showed a significant decrease of 7.66% from 509 to 470 MPa. The ratio of fatigue limit to tensile strength (fatigue ratio) of STS 410 steel decreased from 54.9 to 50.5% as the surface roughness increased from 0.226 to 2.053 μm. Beach marks, a typical shape of a fatigue fracture surface, were observed on the fracture surface near the start point of fatigue failure, and brittle (Fe, Cr, Mn, Si) based non-metallic inclusions that promote crack propagation and reduce fatigue limit existed.

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表面粗糙度对马氏体不锈钢疲劳强度的影响

本研究旨在探讨表面粗糙度对马氏体不锈钢（STS 410）疲劳极限的影响。在对 STS 410 钢进行热处理后，通过改变 STS 410 钢的表面粗糙度条件（A-抛光、A-研磨和 A-#60），分别进行了力学性能测试和旋转弯曲疲劳测试。使用 SEM 和 EDS 对疲劳断裂表面进行了观察和分析。当表面粗糙度从 0.226 μm 增加约 3 倍至 0.664 μm 时，STS 410 钢的疲劳极限从 509 MPa 降至 504 MPa，降幅为 0.98%。然而，当表面粗糙度从 0.226 μm 增加到 2.053 μm 约 9 倍时，从 509 到 470 MPa 的疲劳极限显著降低了 7.66%。随着表面粗糙度从 0.226 μm 增加到 2.053 μm，STS 410 钢的疲劳极限与抗拉强度之比（疲劳比）从 54.9% 下降到 50.5%。在疲劳破坏起点附近的断裂面上观察到了典型的疲劳断裂面形状--滩痕，并且存在脆性（Fe、Cr、Mn、Si）非金属夹杂物，这些夹杂物会促进裂纹扩展并降低疲劳极限。

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来源期刊

International Journal of Precision Engineering and Manufacturing 工程技术-工程：机械

CiteScore

4.10

自引率

10.50%

发文量

115

审稿时长

3-6 weeks

期刊介绍： The International Journal of Precision Engineering and Manufacturing accepts original contributions on all aspects of precision engineering and manufacturing. The journal specific focus areas include, but are not limited to: - Precision Machining Processes - Manufacturing Systems - Robotics and Automation - Machine Tools - Design and Materials - Biomechanical Engineering - Nano/Micro Technology - Rapid Prototyping and Manufacturing - Measurements and Control Surveys and reviews will also be planned in consultation with the Editorial Board.