| 蠕变-疲劳载荷下25 Cr2 MoVA 钢的循环应力松弛行为 |
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| 引用本文： | 张红才,;郑小涛,;轩福贞,;王正东. 蠕变-疲劳载荷下25 Cr2 MoVA 钢的循环应力松弛行为[J]. 压力容器, 2014, 0(9): 23-27 |
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| 作者姓名： | 张红才, 郑小涛, 轩福贞, 王正东 |
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| 作者单位： | [1]华东理工大学承压系统与安全教育部重点实验室,上海200237; [2]武汉工程大学机电工程学院,湖北武汉430205; [3]中国石化湖北化肥分公司,湖北枝江443200 |
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| 基金项目： | 国家自然科学基金项目（51305310） |
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| 摘 要： | 试验测试了500℃时高温螺栓材料25 Cr2 MoVA在应变控制的蠕变-疲劳载荷下的循环应力松弛行为，重点考虑了不同应变幅和峰值保持时间对材料应力松弛行为的影响。研究表明，保持阶段的蠕变变形和循环加载阶段的粘塑性变形共同加速了25 Cr2 MoVA的应力松弛速率，且应变幅小的时候，材料的循环松弛速率更大。
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| 关 键 词： | 25Cr2MoVA钢 蠕变-疲劳 应力松弛 螺栓 |
Cyclic Stress Relaxation Behavior of 25Cr2MoVA Steel under Creep-Fatigue Loadings |
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| Affiliation: | ZHANG Hong-cai, ZHENG Xiao-tao, XUAN Fu-zhen, WANG Zheng-dong ( 1. Key Laboratory of Pressure System and Safety ( Ministry of Education), East China University of Science and Technology, Shanghai 200237, China ;2. School of Mechanical and Electrical Engineering, Wu- han Institute of Technology, Wuhan 430205, China; 3. SINOPEC Hubei Chemical Fertilizer Branch, Zhijiang 443200, China) |
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| Abstract: | Cyclic stress relaxation behavior of high -temperature bolt material 25 Cr2 MoVA was investiga-ted by strain -controlled creep -fatigue tests at 500 ℃.The effects of different strain amplitudes and peak hold time on the stress relaxation behavior of 25Cr2MoVA steel were stressed .Results showed that creep deformation produced during peak hold time together with the visco -plastic deformation took place during cyclic loading stage commonly accelerate the stress relaxation rate of 25 Cr2 MoVA steel , and the strain relaxation rate is greater when the strain amplitude is relatively smaller . |
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| Keywords: | 25Cr2MoVA steel creep-fatigue stress relaxation bolt |
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