| 发电机组再热主汽阀阀碟断裂分析 |
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| 引用本文： | 张远,王梅英.发电机组再热主汽阀阀碟断裂分析[J].理化检验(物理分册),2009(9):575-577. |
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| 作者姓名： | 张远 王梅英 |
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| 作者单位： | 哈尔滨汽轮机厂有限责任公司,哈尔滨150046 |
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| 摘 要： | 采用宏观和微观检验、化学成分分析、力学性能测试及断口分析等方法对断裂的发电机组再热主汽阀的两个阀碟进行了分析。结果表明：阀碟材料的显微组织中有较严重的带状组织偏析，同时δ铁素体在晶界上呈链状分布，这类组织缺陷大）。增加了阀碟材料的脆性，在冲击载荷作用下导致了脆性断裂。
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| 关 键 词： | 阀碟 过载断裂 组织缺陷 冲击载荷 |
Fracture Analysis of Valve Disc of Reheat Main Steam Valve of Electric Generator Unit |
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| ZHANG Yuan,WANG Mei-ying.Fracture Analysis of Valve Disc of Reheat Main Steam Valve of Electric Generator Unit[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2009(9):575-577. |
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| Authors: | ZHANG Yuan WANG Mei-ying |
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| Affiliation: | (Harbin Turbine Company Limited, Harbin 150046, China) |
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| Abstract: | By means of macroscopical and microscopical examination, chemical composition analysis, mechanical property measurement and fracture analysis, the two fracturec valve discs of reheat main steam valve were analyzed. The results showed that there existed serious banded structure segragation in metallographic structure of valve disc, the δ ferrite distributed by chain at crystal boundary, structure defects greatly increased brittleness of valve disc materials. The valve discs fractured caused by impact load exceeding bear capacity of valve dis. |
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| Keywords: | valve disc overload fracture structure defe ＇t impact load |
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