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H13热锻模具钢高周疲劳断裂的实验分析

An Experimental Analysis of the High-Cycle Fatigue Fracture of H13 Hot Forging Tool Steels.

作者信息

Calvo-García Erik, Valverde-Pérez Sara, Riveiro Antonio, Álvarez David, Román Manuel, Magdalena César, Badaoui Aida, Moreira Pedro, Comesaña Rafael

机构信息

Materials Engineering, Applied Mechanics and Construction Department, E.E.I., University of Vigo, 36310 Vigo, Spain.

LaserOn, CINTECX-Research Center in Technologies, Energy and Industrial Processes, University of Vigo, Lagoas-Marcosende, 36310 Vigo, Spain.

出版信息

Materials (Basel). 2022 Oct 22;15(21):7411. doi: 10.3390/ma15217411.

DOI:10.3390/ma15217411
PMID:36363003
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9656740/
Abstract

In this study, the axial fatigue behaviour of hot forging tool steels at room temperature was investigated. Fatigue tests were performed on two steels within the same H13 specification. The fatigue tests were carried out in the high-cycle fatigue domain under normal conditions. These tests were also performed on specimens in contact with a corrosive medium, applying stress values that led to the high-cycle fatigue domain under normal conditions for the sake of comparison. Both materials showed similar fatigue strengths when they were tested under normal conditions. In contrast, corrosion fatigue lives were much lower than in normal tests and differed significantly between the two steels. Crack initiation was triggered by microstructural and surface defects in the normal tests, whereas the formation of corrosion pits caused crack initiation in the corrosion fatigue tests. Moreover, a fracture surface analysis revealed dissimilar crack propagation areas between both steels, which suggested that both steels had different fracture toughness. These results were in line with the differences observed between the carbide and grain sizes of both of the material microstructures.

摘要

在本研究中，对热锻工具钢在室温下的轴向疲劳行为进行了研究。对两种符合相同H13规格的钢进行了疲劳试验。疲劳试验在正常条件下的高周疲劳领域进行。为了进行比较，还对与腐蚀性介质接触的试样进行了试验，施加的应力值在正常条件下会导致进入高周疲劳领域。在正常条件下进行测试时，两种材料显示出相似的疲劳强度。相比之下，腐蚀疲劳寿命远低于正常测试，且两种钢之间存在显著差异。在正常测试中，裂纹萌生由微观结构和表面缺陷引发，而在腐蚀疲劳试验中，腐蚀坑的形成导致裂纹萌生。此外，断口分析揭示了两种钢之间不同的裂纹扩展区域，这表明两种钢具有不同的断裂韧性。这些结果与两种材料微观结构的碳化物和晶粒尺寸之间观察到的差异一致。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1995/9656740/ea217d276dd6/materials-15-07411-g015.jpg
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