摘要
为研究室温(20℃)和反复高温下粮仓用Q460钢的疲劳性能,通过升温、炉内降温和自然冷却模拟反复高温环境,采用轴向疲劳试验对Q460钢的室温疲劳性能以及K=0.78时700℃-Ⅰ、700℃-Ⅱ和700℃-Ⅲ的疲劳寿命和断口形貌特征进行研究,以评估特定应力水平下反复高温对其疲劳寿命和疲劳断口的影响程度。结果表明:反复高温使裂纹扩展区二次裂纹的长度和数量增加,使疲劳辉纹更加清晰。裂纹扩展区面积与应力水平负相关,与最高应力水平相比,最低应力水平的面积增长了4.5倍。Q460钢的疲劳寿命与反复高温次数正相关,与母材相比,3次反复高温后寿命增幅达33%。通过单侧容限系数法构建了室温下Q460钢的P-S-N曲线和γ-P-S-N曲线模型,为室温及反复高温后粮仓用Q460钢的寿命预测提供理论指导依据。
To study the fatigue performance of Q460 steel for granary at room temperature(20℃)and repeated high temperature,the repeated high temperature environment was simulated by heating,cooling in furnace and natural cooling.The fatigue performance of Q460 steel at room temperature,as well as the fatigue life and fracture morphology characteristics of 700℃-I、700℃-II and 700℃-III with K=0.78 were studied by axial fatigue tests to evaluate the effect degree of repeated high temperature on the fatigue life and fatigue fracture under a specific stress level.The results show that repeated high temperature increases the length and number of secondary cracks in the crack propagation zone and makes the fatigue glow more distinct.The area of crack propagation zone is negatively correlated with the stress level,and the area of the lowest stress level is increased by 4.5 times compared with that of the highest stress level.The fatigue life of Q460 steel is positively correlated with the times of repeated high temperature.Compared with the base material,the life of Q460 steel is increased by 33%after three times of repeated high temperature.The P-S-N curve andγ-P-S-N curve models of Q460 steel at room temperature were constructed by one-side tolerance coefficient method,which provides theoretical guidance for the life prediction of Q460 steel for granary after room temperature and repeated high temperature.
作者
贾盛康
缑瑞宾
于敏
程震
王念
JIA Sheng-kang;GOU Rui-bin;YU Min;CHENG Zhen;WANG Nian(College of Mechanical Engineering,Anhui Science and Technology University,Fengyang 233100,China;College of Architecture,Anhui Science and Technology University,Bengbu 233000,China;Bengbu Special Equipment Supervision and Inspection Center,Bengbu 233000,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2024年第11期205-214,共10页
Journal of Plasticity Engineering
基金
安徽省教育厅科学研究重点项目(2022AH051630)
蚌埠市科技计划项目(2022hm06)。
