| 塔机支承座的断裂分析 |
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| 引用本文： | 冯少陵.塔机支承座的断裂分析[J].理化检验(物理分册),2004,40(7):354-355,378. |
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| 作者姓名： | 冯少陵 |
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| 作者单位： | 福建省建筑机械厂,福州,350011 |
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| 摘 要： | 建筑施工用的QT45型塔机支承座在拖运过程中发生断裂。用化学分析、金相检验和热处理工艺试验等方法，对断裂支承座进行了分析。结果表明，铸造钢件支承座碳含量严重超标，导致其与走轮轴焊接时臆性开裂敏感性增大而产生热裂纹；同时支承座毛坯在退火时，耒严格按退火工艺执行，使其晶粒粗走，铁素体沿晶界呈网状析出，降低材料强度，最终导致支承座断裂。
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| 关 键 词： | 支承座 材料成分超标 显微组织 失效 退火处理 |
| 文章编号： | 1001-4012(2004)07-0354-02 |
FRACTURE ANALYSIS OF THE TOWER MACHINE BEARING SUPPORT |
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| FENG Shao-ling.FRACTURE ANALYSIS OF THE TOWER MACHINE BEARING SUPPORT[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2004,40(7):354-355,378. |
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| Authors: | FENG Shao-ling |
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| Abstract: | The left bearing support of the QTZ45 tower machine used in structural building was fractured in operation. By means of chemical composition analysis, metallogical examination and heat-treatment technology testing, the bearing support was analyzed. The results showed, that the carbon content of cast steel bearing support is out of specification. So, when it was welded with the wheel axle, the thermal crack occured. In the anneal process, lecause of the anneal technology is improper, it caused the grain being coarse. Finally, the material strength was decreased, and it caused the bearing support fracture. |
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| Keywords: | Bearing support Material composition is out of the specification Microstructure Failure Anneal treatment |
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