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Small crack initiation and propagation behavior of selective laser melting TC4 alloy under cyclic loading
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Liangliang WU1, 2, 3, Ruida XU1, 2, 3, Zehui JIAO1, 2, 3, Huichen YU1, 2, 3
Journal of Materials Engineering | 2026, 54(4) : 258 - 268
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Journal of Materials Engineering | 2026, 54(4): 258-268
• RESEARCH ARTICLE •
Small crack initiation and propagation behavior of selective laser melting TC4 alloy under cyclic loading
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Liangliang WU1, 2, 3, Ruida XU1, 2, 3, Zehui JIAO1, 2, 3, Huichen YU1, 2, 3
Affiliations
  • 1.AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
  • 2.Key Laboratory of Aeronautical Materials Testing and Evaluation，Aero Engine Corporation of China，Beijing 100095，China
  • 3.Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation，Beijing 100095，China
Published: 2026-04-20 doi: 10.11868/j.issn.1001-4381.2024.000256
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Based on the in-situ fatigue test technique of scanning electron microscope （SEM），the small crack behavior of selective laser melting （SLM） TC4 alloy is studied. The focused ion beam （FIB） technique is used to manufacture the simulative initial defects in the process of additive manufacturing，and the initiation and propagation behavior of small cracks induced by defects are observed under cyclic loading. The results show that under cyclic loading，small cracks are easy to initiate at the surface defect，and the crack fatigue initiation life is short. The fatigue life of SLM TC4 alloys is mainly consumed in the small crack propagation stage. Affected by the microstructure，the small cracks are more likely to propagate along the α/β interface. Due to the random orientation of α laths，the path of small cracks is deflected several times in the initial propagation stage，exhibiting a mixed mode of propagation along α lamellae and through α lamellae within grains， resulting in significant scatter in crack growth rates. At the stable crack propagation stage，the plastic slips of the crack tip are obvious，the influence of microstructure is reduced，and the propagation path tends to straighten. Comparative analysis with long crack growth data indicates that SLM TC4 alloy exhibits a significant “small crack effect”.

selective laser melting  /  TC4 alloy  /  small crack effect  /  crack initiation and propagation
武亮亮, 许瑞达, 焦泽辉, 于慧臣. 循环载荷下激光选区熔化TC4合金小裂纹萌生与扩展行为. 材料工程, 2026 , 54 (4) : 258 -268 . DOI: 10.11868/j.issn.1001-4381.2024.000256
Liangliang WU, Ruida XU, Zehui JIAO, Huichen YU. Small crack initiation and propagation behavior of selective laser melting TC4 alloy under cyclic loading[J]. Journal of Materials Engineering, 2026 , 54 (4) : 258 -268 . DOI: 10.11868/j.issn.1001-4381.2024.000256
Appendix
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Year 2026 volume 54 Issue 4
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Article Info
doi: 10.11868/j.issn.1001-4381.2024.000256
  • Receive Date：2024-04-09
  • Online Date：2026-10-27
  • Published：2026-04-20
Article Data
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History
  • Received：2024-04-09
  • Accepted：2024-05-22
Funding
Affiliations
    1.AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
    2.Key Laboratory of Aeronautical Materials Testing and Evaluation，Aero Engine Corporation of China，Beijing 100095，China
    3.Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation，Beijing 100095，China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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