本文選題：T型釬焊接頭 + 失效機理�。� 參考：《華東理工大學》2017年碩士論文

【摘要】：不銹鋼板翅式換熱器因其結構緊湊、換熱效率高、制作成本低等優(yōu)點,被廣泛運用于核電領域中,換熱器中的板翅結構采用釬焊技術制得,由于換熱器長期服役于高溫高壓等苛刻環(huán)境下,加之釬縫處結構不連續(xù)、力學性能不匹配,裂紋易在釬縫處萌生并擴展,待裂紋擴展到臨界尺寸,釬縫開裂致使換熱設備失效癱瘓。然而當前對板翅結構釬縫的失效機理尚未明確,且缺少完整可靠的力學性能測試標準。因此對板翅結構釬焊接頭高溫力學性能及其失效機理的研究甚為重要�？紤]到板翅式換熱器釬焊接頭失效形式類似于粘接剝離失效,本文采用剝離試驗的方法,研究不同結構參數(shù)及試驗參數(shù)下釬焊接頭的剝離性能,并結合微觀組織分析,探討釬焊接頭的剝離失效機理。主要研究內容如下:1)對T型釬焊接頭進行高溫剝離試驗,得到釬焊接頭的載荷位移曲線,獲得最大剝離力、平均剝離力及斷裂能等剝離性能特征參量。2)分析了母材厚度、釬縫間隙、加載速率及試驗溫度對T型釬焊接頭剝離性能的影響,總結歸納了 T型釬焊接頭剝離性能試驗合理化試樣結構尺寸范圍及試驗條件。3)借助掃描電鏡及EDS能譜分析技術,分析了接頭的元素分布情況,由此劃分了釬焊接頭特征區(qū)域,進一步探討了不同結構參數(shù)及試驗參數(shù)下釬焊接頭剝離失效機理。
[Abstract]:Stainless steel plate-fin heat exchanger is widely used in nuclear power field because of its compact structure, high heat transfer efficiency and low manufacturing cost. Due to the long service of the heat exchanger in harsh environment such as high temperature and high pressure, in addition to the discontinuous structure of the brazing joint and the mismatch of the mechanical properties, the crack is easy to sprout and expand at the brazing joint, and the crack is to be extended to the critical size. The cracking of brazing joint resulted in the failure and paralysis of heat exchanger. However, the failure mechanism of brazed joints of plate-fin structure is not clear, and there is no complete and reliable test standard for mechanical properties. Therefore, it is very important to study the high temperature mechanical properties and failure mechanism of brazed joints of plate-fin structure. Considering that the failure mode of brazed joints in plate-fin heat exchangers is similar to that of adhesive debonding, the peeling properties of brazed joints under different structural parameters and test parameters are studied by means of peeling test, and the microstructure is analyzed. The delamination failure mechanism of brazed joints is discussed. The main research contents are as follows: (1) the peeling test of T-type brazed joint at high temperature is carried out, and the load-displacement curve of brazed joint is obtained, and the peeling characteristic parameters, such as maximum peeling force, average peeling force and fracture energy, are obtained, and the thickness of base metal is analyzed. The effects of brazing clearance, loading rate and test temperature on the peeling properties of T-type brazed joints, In this paper, the structure and dimension range and test conditions of T-type brazed joints are summarized. The distribution of elements in T-type brazed joints is analyzed by means of scanning electron microscope and EDS energy spectrum analysis technique, and the characteristic regions of brazed joints are divided. The delamination failure mechanism of brazed joints with different structure parameters and test parameters is discussed.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG407

【參考文獻】

相關期刊論文 前10條

1 王銀彪;;淺析空分換熱器泄漏的原因及處理方法[J];廣州化工;2013年10期

2 王安普;;不銹鋼高溫釬焊導管斷裂分析及質量控制[J];失效分析與預防;2011年02期

3 劉師田;楊凱珍;;保溫時間和釬焊溫度對真空釬焊304不銹鋼接頭性能的影響[J];熱加工工藝;2011年05期

4 蔣文春;鞏建鳴;涂善東;;保溫時間對304不銹鋼板翅結構真空釬焊的影響[J];機械設計與制造;2010年11期

5 于治水;石昆;言智;李軍;李瑞峰;;釬縫間隙對316L不銹鋼真空釬焊接頭組織的影響[J];材料工程;2010年10期

6 蘆偉;張寧;史耀武;雷永平;;加載速率對SnAgCu釬焊接頭抗剪強度的影響[J];焊接學報;2010年09期

7 鞏建鳴;蔣文春;;釬料厚度對不銹鋼板翅結構抗拉強度影響的有限元分析與試驗研究[J];真空科學與技術學報;2010年05期

8 蔣文春;鞏建鳴;涂善東;;釬焊溫度對304不銹鋼板翅結構強度和微觀組織的影響[J];核動力工程;2010年03期

9 蔣文春;鞏建鳴;涂善東;;冷卻方式對不銹鋼板翅結構強度和微觀組織的影響[J];壓力容器;2009年11期

10 王軼;馬光;鄭晶;賈志華;;鎳基釬料釬焊不銹鋼的釬縫組織及工藝的研究[J];熱加工工藝;2008年23期

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