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北京石油化工學院2026年研究生招生接收調(diào)劑公告

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cjba2

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[求助] 求翻譯，關于電廠鍋爐爆管的

The outside wall of running tube removal has thickand hard slag in the color of maroon. The failed tubesin several occasions had the same characteristics withlarge primary rupture, thin edge, ductile fracture and notiny crack on inside and outside wall. Besides, swellingwas found on the part of tube close to primary rupturewith expansion coefficient 6%. This rupture has typicalcharacteristics of short-term overheated rupture. Thetypical rupture is illustrated in figure 1.
The observation of metallographic microstructure was conducted on the large metalloscope Lec500. The result is shown in Figure 2.The brittle inclusion of SA213-T91 & SA213-T22 original tubes is lower than class 1 and ductile inclusion is less than class 0.5. The original microstructure of SA213-T91 tubes is tempered martensite, no ferrite island, grain size 11; The microstructure of SA213-T22 tube is ferrite + bainite,grain size 7-8.
To the SA213-T91 running tube, the microstructure basically keeps its previous tempered martensite characteristic. But alloy element diffusing occurs on part of right face accompanied by the acicular characteristic decrease and fine grained carbideprecipitation. To the SA213-T22 running tube, the microstructure is ferrite + carbide with a little bainite. It is arranged diffusely for the carbide inside of grain and arranged in chain for the carbide inside of interface.The structure has been at the stage of more seriousaging.The microstructure of SA213-T91 failed tube is long ferrite + carbide + island structure; and that of SA213-T22 failed tube is bright ferrite island + grainy bainite which is phase transformation product betweenthe phase of Acl ~Ac3.

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1樓 2012-03-20 13:41:03

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yuanbing0000

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【答案】應助回帖

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Mally89: 金幣+1, 感謝應助！~歡迎常來！~吼吼！~\(^o^)/~ 2012-03-21 12:01:08
愛與雨下: 金幣+5 2012-03-29 18:56:32
愛與雨下: 金幣+2 2012-03-29 18:56:45
愛與雨下: , bb代發(fā)！ 2012-03-29 18:56:53
愛與雨下: , 額外2個 2012-03-29 18:57:14

供參考：
   清理的透平管外壁有又厚又硬的紫醬色熔渣，幾次不合常理的場合失效管特征相同：大的一次斷裂，邊緣薄，塑性破壞，且內(nèi)外壁無小裂紋。除此之外，靠近一次斷裂處出現(xiàn)膨脹，膨脹率為6%。該斷裂有典型的短期熱裂特征，如圖1所示。
   用大型金相顯微鏡LEC500觀察金相顯微結構，結果如圖2所示。SA213-T91 和 SA213-T22管脆性夾雜物低于1晶族，韌性夾雜物低于0.5晶族。SA213-T91管的原始顯微結構是粒度11的回火馬氏體，無鐵素體組織；SA213-T22管的顯微結構為粒度7-8的鐵素體和貝氏體。
   至于SA213-T91透平管，顯微結構基本保持其先前的回火馬氏體特征，但右界面部分出現(xiàn)合金元素擴散的同時，針狀特征減少且析出細粒碳化物。至于SA213-T22透平管，顯微結構為鐵素體和含有少量貝氏體的碳化物，晶粒內(nèi)的碳化物分散排列，界面內(nèi)的碳化物排成鏈，結構處于嚴重凹陷期。SA213-T91失效管的顯微結構為長鐵素體+碳化物+島狀物結構，SA213-T22失效管的顯微結構為強鐵素體組織和Acl 到Ac3相間的相變產(chǎn)物顆粒狀貝氏體。

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2樓2012-03-20 23:30:12

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