Harmonic structured materials present a good balance of high strength and high ductility due to their peculiar network structure topology. Since long-term durability is critical for their practical applications, so the present work investigated the fatigue properties of a harmonic structured austenitic stainless steel at room temperature under uniaxial stress loading. The harmonic structure designed SUS316L steels were prepared by mechanical milling and subsequent hot isostatic pressing. The enhanced tensile strength in the harmonic structured SUS316L steels was attributed to the ultrafine grains (shell region), which also resulted in the improved resistance to fatigue crack initiation during cyclic loading. Compared to the conventional SUS316L bulk, increased fatigue limit can be achieved in the harmonic structured SUS316L steels. However, the fatigue ratio tends to be a constant value in SUS316L steels having homogeneous grain structure or bimodal grain structure. Moreover, the change of grain size was not significant after fatigue, which demonstrated the harmonic structured SUS316L steels showed good cyclic stability. In addition, the fatigue cracks tended to initiate at core/shell surface due to strain localization. The harmonic structure designed stainless steel demonstrates great attraction for commercial applications due to its good combination of high yield strength, large uniform elongation, good fatigue resistance and cyclic stability.

谐波结构材料由于其独特的网络结构拓扑结构而呈现出高强度和高延展性之间的良好平衡。由于长期耐用性对于它们的实际应用至关重要，因此，本工作研究了谐波结构的奥氏体不锈钢在室温下在单轴应力载荷下的疲劳性能。通过机械铣削和随后的热等静压制来制备设计为谐波结构的SUS316L钢。谐波结构的SUS316L钢抗拉强度的提高归因于超细晶粒（壳区域），这也导致了在循环加载过程中提高的抗疲劳裂纹萌生性。与常规SUS316L块相比，谐波结构SUS316L钢可以提高疲劳极限。然而，在具有均质组织或双峰组织的SUS316L钢中，疲劳率趋于为恒定值。此外，疲劳后晶粒尺寸的变化不明显，这表明谐波结构的SUS316L钢表现出良好的循环稳定性。另外，由于应变局部化，疲劳裂纹倾向于在核/壳表面处开始。谐波结构设计的不锈钢由于具有高屈服强度，大均匀伸长率，良好的抗疲劳性和循环稳定性的良好组合，因此在商业应用中表现出极大的吸引力。证明了谐波结构的SUS316L钢表现出良好的循环稳定性。另外，由于应变局部化，疲劳裂纹倾向于在核/壳表面处开始。谐波结构设计的不锈钢由于具有高屈服强度，大均匀伸长率，良好的抗疲劳性和循环稳定性的良好组合，因此在商业应用中表现出极大的吸引力。证明了谐波结构的SUS316L钢表现出良好的循环稳定性。另外，由于应变局部化，疲劳裂纹倾向于在核/壳表面处开始。谐波结构设计的不锈钢由于具有高屈服强度，大均匀伸长率，良好的抗疲劳性和循环稳定性的良好组合，因此在商业应用中表现出极大的吸引力。