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| 水附着状态下奥贝球铁断裂韧性的脆化行为 | |
| 引用本文： | 蔡启舟,魏伯康,田中雄一,小松真一郎.水附着状态下奥贝球铁断裂韧性的脆化行为[J].华中科技大学学报(自然科学版),2004,32(1):19-21. |
| 作者姓名： | 蔡启舟 魏伯康 田中雄一 小松真一郎 |
| 作者单位： | 1. 华中科技大学,塑性成形模拟及模具技术国家重点实验室,湖北,武汉,430074 2. 室兰工业大学,室兰市,050-8585 3. 近畿大学,东广岛市,739-2116 |
| 基金项目： | 中国博士后科学基金资助项目 (2 0 0 1年度 ) |
| 摘 要： | 研究了水附着状态下奥贝球铁(ADI)断裂韧性的脆化行为．研究结果表明，干燥状态下ADI具有较高的断裂韧性，但水附着状态下ADI的弹塑性断裂韧性JIc降至干燥状态下的20％以下，发生显著的脆化行为；断裂韧性的脆化与试样水浸泡履历无关，长时间(480h)水浸泡试样经再干燥后，其断裂韧性恢复到原有水平．裂纹尖端附着的水在ADI基体塑性变形时分解放出氢，氢扩散至试样的内部使ADI基体中的应力诱变马氏体发生氢脆，导致了ADI断裂韧性的脆化． |
| 关 键 词： | 奥贝球铁（ADI） 水附着 断裂韧性 脆化行为 |
| 文章编号： | 1671-4512(2004)01-0019-03 |
| 修稿时间： | 2003年6月11日 |
Research on embrittlement of fracture toughness in Austempered Ductile Iron by contact with water |
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| Cai Qizhou Wei Bokang Yuichi Tanaka Shinichiro Komastsu Assoc. Prof., State Key Lab of Plastic Forming Simulation and Die & Mould Tech.,Huazhong Univ. of Sci.& Tech.,Wuhan ,China..Research on embrittlement of fracture toughness in Austempered Ductile Iron by contact with water[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,2004,32(1):19-21. | |
| Authors: | Cai Qizhou Wei Bokang Yuichi Tanaka Shinichiro Komastsu Assoc Prof State Key Lab of Plastic Forming Simulation and Die & Mould Tech Huazhong Univ of Sci& Tech Wuhan China |
| Institution: | Cai Qizhou Wei Bokang Yuichi Tanaka Shinichiro Komastsu Assoc. Prof., State Key Lab of Plastic Forming Simulation and Die & Mould Tech.,Huazhong Univ. of Sci.& Tech.,Wuhan 430074,China. |
| Abstract: | The effect of contact with water on fracture toughness of Austempered Ductile Iron (ADI) was investigated. The results showed that the elastic-plastic fracture toughness (J Ic) of ADI has relatively high value in dry conditions, but J Ic values of ADI are less than 20% of those of original dry specimens in wet conditions showing remarkable embrittlement. The history of contact with water has nothing to do with embrittlement of fracture toughness. The specimen dried well after being immersed in water for 480 h exhibited the similar J Ic value to that of an original dry specimen. It was suggested that the embrittlement of fracture toughness of ADI resulted from hydrogen embrittlement in stress-induced martensite, and hydrogen came from the decomposition of water on the crack tip during plastic deformation. |
| Keywords: | austempered ductile iron (ADI) contact water fracture toughness embrittlement |
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