| 2．25Cr─1Mo钢焊接接头蠕变断裂时碳化物状态的研究 |
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| 引用本文： | 罗宇,赵秀娟,陈春焕,刘志权.2．25Cr─1Mo钢焊接接头蠕变断裂时碳化物状态的研究[J].大连铁道学院学报,1996(4). |
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| 作者姓名： | 罗宇 赵秀娟 陈春焕 刘志权 |
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| 作者单位： | 大连铁道学院科研处 |
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| 摘 要： | 选择２２５Ｃｒ─１Ｍｏ钢手工电弧多层焊焊接头进行了不同工艺规范的持久强度试验，用透射电镜对蠕变断裂时母材和焊缝碳化物的形态、大小和分布进行了分析，采用选区电子衍射和ＥＤＡＸ能谱分析方法对析出的碳化物类型进行了鉴定．结果表明，试验中出现的碳化物类型分别为Ｆｅ３Ｃ，Ｍｏ２Ｃ和Ｍ２３Ｃ６．在试验时间较长应力较小时，断裂试样中针状Ｍｏ２Ｃ在晶内聚集粗化，块状Ｍ２３Ｃ６在晶界聚集粗化，这种碳化物分布状态是影响蠕变断裂的主要因素．
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| 关 键 词： | 焊接接头 蠕变断裂 持久强度试验 |
The Carbide Constitution of 2.25Cr-1Mo Steel Welding Joints at the Creep Rupture |
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| Luo Yu,Zhao xiujuan,Chen Chunhuan,Liu Zhiquan.The Carbide Constitution of 2.25Cr-1Mo Steel Welding Joints at the Creep Rupture[J].Journal of Dalian Railway Institute,1996(4). |
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| Authors: | Luo Yu Zhao xiujuan Chen Chunhuan Liu Zhiquan |
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| Institution: | Luo Yu;Zhao xiujuan;Chen Chunhuan;Liu Zhiquan(Department of Science Research)(Dept. of Material Science and Engineering) |
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| Abstract: | The durability strength testsof 2.25Cr-1Mo steel manual are welding joints are done in the different procedures.The carbide size and distribution in the base and weld metals at the creep rupture are analyzed with TEM, and the carbide types are determined by means of SAD and EDAX.The results show that the carbide types found are separately Fe3C,Mo2C and M23C6. When the test duration is longer and the stress is lower, the acicular Mo2C in the rupture specimen gather and coarse in the grains,and the granular M23C6 do at the boundaries .This kind of carbide distribution and constitution are main factors which affect the creep rupture. |
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| Keywords: | welding joins creep fracture/durability strength test |
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