發(fā)布時間：2018-05-07 18:17

  本文選題：調(diào)質(zhì) + 數(shù)值模擬��； 參考：《天津職業(yè)技術師范大學》2015年碩士論文

【摘要】：模具是工業(yè)發(fā)展的基礎，是工業(yè)化實現(xiàn)產(chǎn)品批量生產(chǎn)和新產(chǎn)品研發(fā)不可或缺的成型工具。Cr12MoV鋼是國內(nèi)外應用最廣泛的冷作模具鋼之一，在現(xiàn)代工業(yè)應用中占有十分重要的地位。Cr12MoV鋼的強度、硬度較高，耐磨性較好，其韌性較差，因而對熱處理工藝和熱加工工藝要求較高，若處理工藝不當，很容易造成模具的過早失效。傳統(tǒng)的熱處理工藝開發(fā)多采用經(jīng)驗和半經(jīng)驗的方法，不僅耗費大量的人力、財力，而且難以精確地控制質(zhì)量。隨著計算機技術的發(fā)展和新的模擬技術的出現(xiàn)，熱處理過程的數(shù)值模擬也隨之成為一個倍受關注的研究領域。 本文以Cr12MoV鋼為研究對象，基于理論、模擬和實驗相結合的技術路線，將相變-熱-力多場耦合理論應用到Cr12MoV鋼調(diào)質(zhì)過程中。采用COSMAP有限元分析軟件對Cr12MoV鋼調(diào)質(zhì)過程的溫度場、組織場、應力場進行了研究。 研究Cr12MoV鋼調(diào)質(zhì)過程的溫度場。同時考慮變形熱、相變潛熱以及非線性參數(shù)的影響，對Cr12MoV鋼熱處理過程溫度的變化進行了預測。通過采集系統(tǒng)得到試樣外表面和中心處的冷卻曲線來驗證熱處理過程中溫度的變化情況。 研究Cr12MoV鋼調(diào)質(zhì)過程的組織場。分別預測了淬火和回火階段組織和硬度的變化和分布情況。通過試驗驗證了組織和硬度的模擬結果。 研究Cr12MoV鋼調(diào)質(zhì)過程的應力場。分別對Cr12MoV鋼熱處理后的應力和變形進行了預測，，得出了Cr12MoV鋼淬火和回火階段殘余應力的變化規(guī)律以及不同熱處理條件下的變形量大小及分布。通過影像測量儀驗證了數(shù)值分析的變形量。 基于以上結果，最終建立了可優(yōu)化Cr12MoV鋼熱處理工藝參數(shù)的有限元模型。
[Abstract]:Mould is the foundation of industrial development, and it is one of the most widely used cold-working die steels at home and abroad, which is an indispensable forming tool for industrial mass production and new product research and development. The strength, hardness, wear resistance and toughness of Cr12MoV steel are very important in modern industrial application. It is easy to cause premature failure of the mould. The traditional heat treatment process development mostly adopts the experience and the half experience method, which not only consumes a lot of manpower and financial resources, but also is difficult to control the quality accurately. With the development of computer technology and the emergence of new simulation technology, numerical simulation of heat treatment process has become a research field. Taking Cr12MoV steel as the research object, based on the technical route of combining theory, simulation and experiment, the phase-change thermal-force multi-field coupling theory is applied to the quenching and tempering process of Cr12MoV steel. The temperature field, microstructure field and stress field of Cr12MoV steel during quenching and tempering were studied by COSMAP finite element analysis software. The temperature field of Cr12MoV steel during quenching and tempering is studied. Considering the influence of deformation heat, latent heat of transformation and nonlinear parameters, the variation of temperature during heat treatment of Cr12MoV steel was predicted. The cooling curves at the outer surface and the center of the sample were obtained by the acquisition system to verify the change of temperature during heat treatment. The microstructure field of Cr12MoV steel during quenching and tempering was studied. The change and distribution of microstructure and hardness in quenching and tempering stages were predicted respectively. The simulation results of microstructure and hardness are verified by experiments. The stress field of Cr12MoV steel during quenching and tempering is studied. The stress and deformation of Cr12MoV steel after heat treatment were predicted, and the variation law of residual stress in quenching and tempering of Cr12MoV steel was obtained, as well as the magnitude and distribution of deformation under different heat treatment conditions. The deformation of the numerical analysis is verified by the image measuring instrument. Based on the above results, a finite element model for optimizing the heat treatment process parameters of Cr12MoV steel is established.
【學位授予單位】：天津職業(yè)技術師范大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG142.1

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本文編號：1857963