本文選題：滲碳淬火 + 耦合　； 參考：《燕山大學(xué)》2015年碩士論文

【摘要】：滲碳淬火作為改變和提高材料性能的重要手段,在汽車、航空、及其他制造業(yè)領(lǐng)域有著廣泛的應(yīng)用。但淬火過程是一個復(fù)雜的多場耦合過程,傳統(tǒng)熱處理技術(shù)已經(jīng)不能適應(yīng)機械現(xiàn)代化的要求,應(yīng)用計算機技術(shù)改造熱處理已成為當(dāng)務(wù)之急。本文針對開閉口圓環(huán)等常見工件的淬火應(yīng)力與變形問題,基于大型有限元分析軟件ANSYS,對滲碳開閉口圓環(huán)的淬火工藝進(jìn)行仿真模擬,分析其溫度場與應(yīng)力場的分布規(guī)律和開口圓環(huán)工件淬火變形特點�；趥鳠釋W(xué)基本原理,熱彈塑性理論,相變理論,采用有限元軟件ANSYS,對滲碳開閉口圓環(huán)淬火冷卻過程的溫度場進(jìn)行的數(shù)值模擬。根據(jù)模擬需要,將參數(shù)連續(xù)變化的滲碳層簡化為階梯變化,利用APDL語言編制了試件模型以及滲碳層模型,各種材料參數(shù)的輸入的命令流文件,可方便模型和參數(shù)的修改,實現(xiàn)模擬滲碳淬火過程的參數(shù)化分析�？紤]了馬氏體相變潛熱,并根據(jù)溫度場的模擬結(jié)果對馬氏體組織轉(zhuǎn)變過程進(jìn)行了預(yù)測。將溫度場模擬結(jié)果作為預(yù)定義場,對滲碳開閉口圓環(huán)淬火過程中的應(yīng)力場進(jìn)行模擬,分析滲碳開閉口圓環(huán)在整個淬火過程中應(yīng)力場的變化規(guī)律,以及最終殘余應(yīng)力的分布情況。并對殘余應(yīng)力場的分布特點進(jìn)行了分析,為零件滲碳工藝的確定提供理論參考。對滲碳開口圓環(huán)淬火后的變形問題進(jìn)行了分析,探究了引起變形的原因以及變形的種類,觀察淬火過程中,在熱應(yīng)力和組織應(yīng)力共同作用下產(chǎn)生的開口圓環(huán)淬火變形,通過對比模擬結(jié)果中各方向上變形量的數(shù)值,研究了不同淬火溫度和不同冷卻速度條件對淬火變形的影響。
[Abstract]:Carburizing quenching, as an important means to change and improve the properties of materials, is widely used in automobile, aviation, and other manufacturing fields. However, the quenching process is a complex multi-field coupling process, the traditional heat treatment technology can no longer meet the requirements of mechanical modernization, the application of computer technology to transform heat treatment has become an urgent task. Aiming at the problem of quenching stress and deformation of common workpiece such as open and close ring, this paper simulates the quenching process of carburized open and closed ring based on ANSYS, a large-scale finite element analysis software. The distribution law of temperature field and stress field and quenching deformation characteristics of open ring workpiece are analyzed. Based on the basic principles of heat transfer, thermoelastic-plastic theory and phase transformation theory, the numerical simulation of the temperature field in the cooling process of carburized open and closed ring quenching is carried out by using the finite element software ANSYS. According to the need of simulation, the Carburized layer with continuous variation of parameters is simplified as a step change. The sample model and Carburizing layer model are compiled by using APDL language, and the input command flow files of various material parameters can be easily modified. Parametric analysis of simulated Carburizing quenching process is realized. The latent heat of martensite transformation is considered and the microstructure transformation process of martensite is predicted according to the simulation results of temperature field. The simulation results of temperature field are taken as the predefined field to simulate the stress field during the quenching process of carburized open and closed ring. The variation law of stress field and the distribution of final residual stress in the whole quenching process of carburized open and closed ring are analyzed. The distribution characteristics of residual stress field are analyzed, which provides a theoretical reference for the determination of Carburizing process. In this paper, the deformation of carburized open ring after quenching is analyzed, the causes and types of deformation are explored, and the quenching deformation of open ring is observed under the joint action of thermal stress and microstructure stress during quenching. The effects of different quenching temperature and cooling rate on quenching deformation were studied by comparing the values of deformation in different directions in the simulation results.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG156.3

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本文編號：2019809