【作者】 雷旻； 梁益龙； 万明攀； 杨伟； 田琴； 凌敏；

【Author】 LEI Min LIANG Yi-long WAN Ming-pan YANG Wei TIAN Qin LING Min (Key Laboratory for Structure and Strength of Materials,GuiZhou;School of Materials Science and Metallurgy Engineering,Guizhou University,Guiyang 550003,China)

【机构】 贵州省材料结构与强度重点实验室,贵州大学材料科学与冶金工程学院；

【摘要】 某输入功率为710kW 的减速机使用中直径达120mm 的高速轴发生早期断裂。通过对该断裂轴进行材料成分检测、宏微观断口分析、显微组织检验、显微硬度及常规力学性能检测和分析后表明,齿轮轴材料成分、夹杂物级别符合相关技术要求；其断裂方式为多源疲劳脆性断裂,其主裂纹源萌生于高速轴键槽的受力侧,表面硬度低(仅为35-38HRC,没有达到技术图纸所要求的59-62HRC),屈服强度低、无有效的表面强化硬化层是导致齿轮轴发生早期疲劳破坏的主要原因。更多还原

【Abstract】 The high-speed shaft of one reducer whose input-power was 710kW was early fracturing and the diameter is 120mm.The composition,fracture surface,microscopic structure,micro-hardness and conventional mechanical properties of the fractured shaft were investigated.The results show the composition and the grade of inclusion of this one meet relative technique requirements.But the fracture modes of this one is fatigue cracking of multiple sources. The main crack initiates in the stressed side of keyway of this one.The surface hardness is HRC35-38 which doesn’t meet the demand (the demand is HRC59-62).Lower yield strength,lack of surface hardening layer and above mentioned factors lead to early fatigue fracture of this high-speed shaft.更多还原