Ultrahigh Cycle Fatigue Performance of GH4169 Alloy by Selective Laser Melting
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摘要: 对经标准热处理的激光选区熔化（SLM）成形GH4169合金进行了拉伸试验和105~109周次高周/超高周疲劳试验，研究了其拉伸性能、疲劳性能和断口形貌，并分析了疲劳断裂机理。结果表明：热处理态SLM成形GH4169合金的抗拉强度和屈服强度较锻件的有所提高，但伸长率大幅下降，弹性模量略有下降；合金S-N曲线呈现阶梯状，在4×105周次和5×107周次附近出现拐点；在105~107周次高周疲劳区间试样的裂纹均萌生于表面，而在超过107周次超高周疲劳区间试样的裂纹大多萌生于内部，其裂纹源为激光能量密度过高产生的圆形匙孔，孔内残留的碳化物会加速裂纹萌生，降低疲劳寿命。Abstract: Tensile test and high/ultrahigh cycle fatigue tests with 105-109 cycles were carried out on selective laser melting (SLM) formed GH4169 alloy; the alloy was heat treated standardly. The tensile properties, fatigue properties and fracture morphology were studied, and the fatigue fracture mechanism was analyzed. The results show that after heat treatment, the tensile strength and yield strength of SLM formed GH4169 alloy were higher than those of forgings, but the elongation was greatly reduced, and the elastic modulus was slightly reduced. The S-N curve of SLM formed GH4169 alloy presented a stepped shape, showing inflection points near the 4×105 cycles and 5×107 cycles. The cracks of specimens in the high-cycle fatigue interval of 105-107 cycles all originated on the surface, while those in the ultrahigh cycle fatigue life interval exceeding 107 cycles were mostly generated inside. The internal crack source was the circular keyhole produced by the high laser energy density, and the residual carbide in the hole accelerated the crack initiation and reduced the fatigue life.
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Keywords:
- selective laser melting /
- GH4169 alloy /
- ultrahigh cycle fatigue /
- keyhole
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