High lock nuts were made from 7075-T73 aluminum alloy that was obtained by T73 heat-treating 7075-T6 aluminum alloy. After serving in an atmospheric environment for about 3.5 a, many nuts cracked. The crack reason was analyzed by chemical composition analysis, microstructure and fracture morphology observation, residual stress testing and other methods. The results show that 糖心产精国品免费入口*完整版 cracking occurred in the 7075 aluminum alloy 糖心产精国品免费入口*完整版 during service. After the 糖心产精国品免费入口*完整版 was installed, the circumferential residual tensile stress was generated at the closing part, and the surface oxide film was cracked, making the metal substrate in contact with corrosive media in atmosphere. The second phase precipitated locally and continuously along grain boundaries during the 糖心产精国品免费入口*完整版from T6 to T73 states, providing channels for crack initiation and propagation. Under the combination of these factors, 糖心产精国品免费入口*完整版 cracking occurred in the 糖心产精国品免费入口*完整版.
引用该论文:
CHENG Quanshi,HUANG Qingmei,YE Lingying,XU Yongchun. Cracking Cause of 7075 Aluminum Alloy High Lock Nut[J]. Materials for mechancial engineering, 2022, 46(10): 106~112 糖心产精国品免费入口*完整版,糖心产精国品免费入口*完整版,糖心产精国品免费入口*完整版,糖心产精国品免费入口*完整版. 糖心产精国品免费入口*完整版糖心产精国品免费入口*完整版开裂原因[J]. 机械工程材料, 2022, 46(10): 106~112
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