發(fā)布時(shí)間：2018-05-07 00:03

  本文選題：T型釬焊接頭 + 失效機(jī)理　； 參考：《華東理工大學(xué)》2017年碩士論文

【摘要】：不銹鋼板翅式換熱器因其結(jié)構(gòu)緊湊、換熱效率高、制作成本低等優(yōu)點(diǎn),被廣泛運(yùn)用于核電領(lǐng)域中,換熱器中的板翅結(jié)構(gòu)采用釬焊技術(shù)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(jié)構(gòu)不連續(xù)、力學(xué)性能不匹配,裂紋易在釬縫處萌生并擴(kuò)展,待裂紋擴(kuò)展到臨界尺寸,釬縫開裂致使換熱設(shè)備失效癱瘓。然而當(dāng)前對板翅結(jié)構(gòu)釬縫的失效機(jī)理尚未明確,且缺少完整可靠的力學(xué)性能測試標(biāo)準(zhǔn)。因此對板翅結(jié)構(gòu)釬焊接頭高溫力學(xué)性能及其失效機(jī)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(yàn)的方法,研究不同結(jié)構(gòu)參數(shù)及試驗(yàn)參數(shù)下釬焊接頭的剝離性能,并結(jié)合微觀組織分析,探討釬焊接頭的剝離失效機(jī)理。主要研究內(nèi)容如下:1)對T型釬焊接頭進(jìn)行高溫剝離試驗(yàn),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(yàn)溫度對T型釬焊接頭剝離性能的影響,總結(jié)歸納了 T型釬焊接頭剝離性能試驗(yàn)合理化試樣結(jié)構(gòu)尺寸范圍及試驗(yàn)條件。3)借助掃描電鏡及EDS能譜分析技術(shù),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(jìn)一步探討了不同結(jié)構(gòu)參數(shù)及試驗(yàn)參數(shù)下釬焊接頭剝離失效機(jī)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(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG407

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本文編號：1854482