| 热变形对中铬半钢热疲劳裂纹扩展动力学的影响 |
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| 引用本文： | 常立民,刘建华,于升学,蔡大勇,杨庆祥. 热变形对中铬半钢热疲劳裂纹扩展动力学的影响[J]. 钢铁研究学报, 2002, 14(2): 32-34 |
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| 作者姓名： | 常立民 刘建华 于升学 蔡大勇 杨庆祥 |
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| 作者单位： | 1. 四平师范学院分析测试中心,吉林,四平,136000
2. 燕山大学材料与化工学院,河北,秦皇岛,066004 |
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| 基金项目： | 河北省科学技术研究指导计划资助项目 (9412 2 12 3 ) |
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| 摘 要： | 研究了热变形对中铬半钢热疲劳裂纹扩展动力学的影响。结果表明 :中铬半钢的热疲劳裂纹扩展符合 L =b Na(a<1)的关系。变形量小于 4 0 %时 ,随变形量的增加 ,裂纹扩展速率减小 ,其激活能随之增大。这些变化是由于碳化物形状的改变和粒状碳化物的析出所致。
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| 关 键 词： | 热变形 铬钢 热疲劳裂纹 |
| 文章编号： | 1001-0963(2002)02-0032-03 |
| 修稿时间： | 2001-07-20 |
Effect of Hot Deformation on Dynamics of Thermal Fatigue Crack Propagation in Medium Chromium Semi-Steel |
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| CHANG Li min ,LIU Jian hua ,YU Sheng xue ,CAI Da yong ,YANG Qing xiang. Effect of Hot Deformation on Dynamics of Thermal Fatigue Crack Propagation in Medium Chromium Semi-Steel[J]. Journal of Iron and Steel Research, 2002, 14(2): 32-34 |
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| Authors: | CHANG Li min LIU Jian hua YU Sheng xue CAI Da yong YANG Qing xiang |
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| Affiliation: | CHANG Li min 1,LIU Jian hua 2,YU Sheng xue 2,CAI Da yong 2,YANG Qing xiang 2 |
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| Abstract: | The effect of hot deformation on dynamics of thermal fatigue crack propagation in medium chromium semi steel was studied. The results showed that the thermal fatigue crack propagation in medium chromium semi steel is in keeping with L=bN a (a <1), the speed of thermal fatigue crack propagation reduces, and the activation energy of crack propagation increases with the increase of hot deformation rate, when hot deformation rate is less than 40 %. All these changes are due to the change of carbide morphology and precipitation of granular carbides. |
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| Keywords: | hot deformation chromium steel thermal fatigue crack |
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