| 12Cr2MoWVTiB钢焊缝微裂纹产生机理研究 |
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| 引用本文： | 潘春旭 王海波. 12Cr2MoWVTiB钢焊缝微裂纹产生机理研究[J]. 材料科学与工艺, 1993, 1(4): 87-90 |
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| 作者姓名： | 潘春旭 王海波 |
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| 作者单位： | 武汉水运工程学院船机系，武汉水运工程学院，武汉锅炉厂，武汉锅炉厂 430063 |
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| 摘 要： | 利用透射电子显微镜技术研究了１２Ｃｒ２ＭｏＷＶＴｉＢ耐钢焊缝区产生裂纹的微观机理，文中提出，粒状贝氏中大量的富氢微孪晶马氏体Ｍ－Ａ小岛引起的延迟微裂纹；柱晶晶界间的多晶低熔共晶膜引起的结晶裂纹以及外加拘束应力等三者之间的相互作用，导致该裂纹的产生，初步讨论了避免焊缝裂纹的方法，首次在ＴＥＭ下观察到了低熔共晶膜的形态。
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| 关 键 词： | 焊缝 裂纹 铬钼钢 焊接 |
Study on Microcracking Mechanism of Weld in 12Cr2MoWVTiB Steel |
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| Pan Chunxu Zhang Zhihui. Study on Microcracking Mechanism of Weld in 12Cr2MoWVTiB Steel[J]. Materials Science and Technology, 1993, 1(4): 87-90 |
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| Authors: | Pan Chunxu Zhang Zhihui |
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| Affiliation: | Pan Chunxu Zhang Zhihui (Wuhan University of Water Transportation Engineering) Wang Haibo Cheng Yongkang (Wuhan Boiler Plant) |
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| Abstract: | The microcracking Mechanism of weld of 12Cr2MoWVTib heat-resisting steel has been studied under TEM. The results show that the crack is caused by the interaction of three factors: 1. lots of hydrogen-rich austenite and micro-twin martensite (M-A) islands in granular bainite induce the delayed crack; 2. The polycrystalline eutectic film existing in the boundary of primary austenite causes the solidification crack; 3. External restraint stress. The method for reducing the cracks is discussed and the TEM morphology of the eutectic film is first observed. |
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| Keywords: | TEM weld crack |
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