500MPa级针状铁素体钢的低周疲劳行为
采用光滑圆柱疲劳试样,通过对500MPa级针状铁素体钢进行轴向总应变控制模式的室温低周疲劳实验,研究了实验钢的循环应力-应变行为、应变-寿命特性及循环应力响应。结果表明：当总应变幅为临界应变幅时（Δεt/2=0.35%）,循环一开始就进入饱和状态,应力幅值保持不变;当总应变幅低于临界应变幅时（0.2%≤Δεt/2〈0.35%）,实验钢表现出循环软化特性;当总应变幅高于临界应变幅时（0.35%〈Δεt/2≤0.6%）,实验钢先表现出循环硬化,达到循环饱和后又表现出循环软化特性。疲劳断口的SEM分析表明,疲劳裂纹通常萌生于试样一侧的表面,具有多源性,且裂纹的扩展符合Laird的塑性钝化机制。...
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| Published in | 材料工程 no. 12; pp. 83 - 88 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
北京科技大学冶金工程研究院,北京,100083%南京钢铁股份有限公司研发中心,南京,210035
2012
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-4381 1001-4381 |
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| Summary: | 采用光滑圆柱疲劳试样,通过对500MPa级针状铁素体钢进行轴向总应变控制模式的室温低周疲劳实验,研究了实验钢的循环应力-应变行为、应变-寿命特性及循环应力响应。结果表明：当总应变幅为临界应变幅时（Δεt/2=0.35%）,循环一开始就进入饱和状态,应力幅值保持不变;当总应变幅低于临界应变幅时（0.2%≤Δεt/2〈0.35%）,实验钢表现出循环软化特性;当总应变幅高于临界应变幅时（0.35%〈Δεt/2≤0.6%）,实验钢先表现出循环硬化,达到循环饱和后又表现出循环软化特性。疲劳断口的SEM分析表明,疲劳裂纹通常萌生于试样一侧的表面,具有多源性,且裂纹的扩展符合Laird的塑性钝化机制。 |
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| Bibliography: | ZHENG Hong-wei1,TANG Di1,WU Hui-bin1,YANG Liu1,LIU Li-hua2（1 Engineering Research Institute,University of Science and Technology Beijing, Beijing 100083,China;2 The Research and Development Center of Nanjing Iron and Steel Co.,Ltd.,Nanjing 210035,China） 11-1800/TB acicular ferrite; low cycle fatigue; cyclic stress-strain behavior; strain-life feature; cyclic stressresponse Low cycle fatigue tests for 500MPa grade acicular ferrite steel were conducted with smooth rotundity-section specimens under fully reversed total strain control cycling at room temperature.Cyclic stress-strain behavior,strain-life feature and cyclic stress response were investigated through the tests.The results show that when Δεt/2 equals to 0.35%,the tested steel quickly achieves cyclic saturation,and the stress amplitudes remains almost constant.When Δεt/2 is less than 0.35%,the tested steel shows cyclic softening until failure.When Δεt/2 is higher than 0.35%,the tested steel shows cyclic hardening which is followed by cyclic softening unti |
| ISSN: | 1001-4381 1001-4381 |