本文選題：IN690高溫合金 + 管材擠壓�。� 參考：《沈陽理工大學(xué)》2015年碩士論文

【摘要】：IN690高溫合金是一種奧氏體型鎳基變形高溫合金,它具有高強度、良好的冶金穩(wěn)定性、良好的焊接性和優(yōu)良的加工特性,更重要是其具有優(yōu)異的抗晶間應(yīng)力腐蝕能力,已經(jīng)成為核電管材方面的理想材料。本文通過實驗數(shù)據(jù)和數(shù)值模擬的方法對IN690合金管材擠壓過程進(jìn)行了研究,為管材擠壓的實際生產(chǎn)提供了理論依據(jù)。主要研究成果和結(jié)論如下:(1)通過等溫恒應(yīng)變速率壓縮實驗得到的真應(yīng)力-應(yīng)變曲線,系統(tǒng)研究了IN690合金的熱變形行為。并基于熱壓縮實驗結(jié)果,建立了IN690合金的本構(gòu)關(guān)系模型。(2)對IN690合金擠壓過程中的潤滑行為進(jìn)行數(shù)值模擬。研究了不同玻璃墊傾角下的擠壓力變化,以及玻璃墊對擠壓過程的影響。得到了玻璃墊合理的傾角和玻璃墊在擠壓過程中的作用。(3)通過有限元軟件對IN690高溫合金管材擠壓成形過程進(jìn)行多場耦合數(shù)值模擬,研究了不同工藝參數(shù)下溫度場、應(yīng)力場以及擠壓力的變化規(guī)律。得到了不同工藝參數(shù)對管材擠壓過程的影響規(guī)律。(4)采用Fortran語言編制IN690合金的微觀組織演變模型的子程序,并結(jié)合有限元軟件Marc對IN690合金管材擠壓過程進(jìn)行了微觀組織模擬,分析了不同工藝參數(shù)下管材擠壓成形過程中晶粒尺寸、再結(jié)晶分?jǐn)?shù)的演變規(guī)律。將模擬的平均晶粒尺寸與實驗結(jié)果進(jìn)行對比。驗證了數(shù)值模擬的準(zhǔn)確性,并獲得了管材擠壓過程合理的工藝參數(shù)。
[Abstract]:IN690 superalloy is a kind of austenitic nickel base deformed superalloy. It has high strength, good metallurgical stability, good weldability and good processing properties. More importantly, it has excellent resistance to intergranular stress corrosion. Nuclear pipe has become an ideal material. In this paper, the extrusion process of IN690 alloy tube is studied by means of experimental data and numerical simulation, which provides a theoretical basis for the practical production of tube extrusion. The main results and conclusions are as follows: (1) the thermal deformation behavior of IN690 alloy is systematically studied by the true stress-strain curve obtained by isothermal constant strain rate compression experiment. Based on the experimental results of hot compression, the constitutive relation model of IN690 alloy is established. (2) the lubrication behavior of IN690 alloy during extrusion is simulated numerically. The influence of glass cushion on extrusion process was studied. The reasonable dip angle of glass pad and the function of glass cushion in extrusion process are obtained. The numerical simulation of multi-field coupling of IN690 superalloy tube extrusion process is carried out by finite element software, and the temperature field under different technological parameters is studied. The variation of stress field and extrusion pressure. The influence of different process parameters on tube extrusion process was obtained. (4) the subroutine of microstructure evolution model of IN690 alloy was compiled by Fortran language, and the microstructure of IN690 alloy tube extrusion process was simulated with finite element software Marc. The evolution of grain size and recrystallization fraction in tube extrusion forming process with different technological parameters was analyzed. The simulated average grain size is compared with the experimental results. The accuracy of numerical simulation is verified and the reasonable technological parameters of tube extrusion process are obtained.
【學(xué)位授予單位】：沈陽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG376

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