【摘要】：感應(yīng)加熱技術(shù)對(duì)于回轉(zhuǎn)類零件改性及修復(fù)具有獨(dú)特的優(yōu)勢,因此在表面熱處理領(lǐng)域中應(yīng)用十分廣泛。然而現(xiàn)有涂層的制備工藝還不成熟,熔覆過程中易出現(xiàn)流淌、氧化等問題,并且針對(duì)合金涂層的質(zhì)量尚無直觀的評(píng)價(jià)標(biāo)準(zhǔn),不能定量分析涂層質(zhì)量,此問題已成為限制感應(yīng)熔覆技術(shù)發(fā)展的主要因素。本課題以感應(yīng)熔鑄合金涂層的稀釋率控制和工藝優(yōu)化為研究目標(biāo),深入研究涂層與基材之間的擴(kuò)散規(guī)律,引入稀釋率概念,探索稀釋率的控制方法。主要的研究內(nèi)容如下所示:針對(duì)感應(yīng)熔覆過程中涂層流淌及氧化問題,改善涂層制備技術(shù),引入感應(yīng)熔鑄工藝。搭建感應(yīng)熔鑄Ni60的實(shí)驗(yàn)平臺(tái),分析涂層與基體的組織成分,重點(diǎn)觀察涂層與基體之間的元素?cái)U(kuò)散現(xiàn)象,以及由于擴(kuò)散導(dǎo)致的硬度分布變化。借鑒激光熔覆中稀釋率的研究,引入感應(yīng)熔鑄稀釋率概念,并總結(jié)其計(jì)算方法。根據(jù)感應(yīng)熔鑄稀釋率的計(jì)算方法,溫度場的分布是工件熔化稀釋的基礎(chǔ)。因此考慮材料的溫變效應(yīng),建立含有相變過程的感應(yīng)熔鑄溫度場模型,并采用熱電偶測溫進(jìn)行驗(yàn)證。分析不同工藝參數(shù)對(duì)溫度場分布的影響規(guī)律,重點(diǎn)研究冷卻凝固過程中溫度場變化,探索感應(yīng)熔鑄過程中熱流傳遞規(guī)律,為熔池分析提供基礎(chǔ)。在已驗(yàn)證的溫度場模型計(jì)算基礎(chǔ)上,建立感應(yīng)熔鑄熔池模型,研究在加熱及冷卻過程中熔池形貌變化及熔池移動(dòng)規(guī)律,計(jì)算熔池內(nèi)部的溫度場分布特征,研究熔池中溶質(zhì)流動(dòng)規(guī)律。另外,探索工藝參數(shù)對(duì)感應(yīng)熔鑄熔池截面積大小以及熔池內(nèi)部的流動(dòng)劇烈程度的影響�；趯�(duì)熔池的研究,根據(jù)感應(yīng)熔鑄稀釋率的計(jì)算方法,研究工藝參數(shù)單因素對(duì)稀釋率大小的影響規(guī)律。采用正交試驗(yàn)分析方法,設(shè)置殘余應(yīng)力值為輔助目標(biāo)參數(shù),分析各個(gè)因素對(duì)稀釋率的敏感程度,篩選出較優(yōu)的因素組合。結(jié)合感應(yīng)熔鑄稀釋規(guī)律的實(shí)驗(yàn)研究,總結(jié)稀釋率的控制方法并優(yōu)化感應(yīng)熔鑄的工藝。
[Abstract]:Induction heating technology has unique advantages in modification and repair of rotary parts, so it is widely used in the field of surface heat treatment. However, the existing coating preparation process is not mature, and the process of cladding is prone to flow, oxidation and other problems, and there is no intuitive evaluation standard for the quality of alloy coating, so the coating quality can not be quantitatively analyzed. This problem has become the main factor limiting the development of induction cladding technology. The aim of this paper is to study the dilution rate control and process optimization of induction casting alloy coating. The diffusion law between the coating and the substrate is deeply studied. The concept of dilution rate is introduced and the control method of dilution rate is explored. The main research contents are as follows: aiming at the problem of coating flow and oxidation during induction cladding process, the coating preparation technology is improved and induction melting casting process is introduced. The experimental platform of induction melting casting Ni60 was set up to analyze the microstructure of coating and substrate and to observe the phenomenon of element diffusion between coating and substrate and the change of hardness distribution caused by diffusion. Based on the study of dilution rate in laser cladding, the concept of induction casting dilution rate is introduced and its calculation method is summarized. According to the method of calculating dilution rate of induction melting casting, the distribution of temperature field is the basis of melting dilution of workpiece. Therefore, considering the effect of material temperature variation, the model of induction melting casting temperature field with phase change process is established and verified by thermocouple. The influence of different process parameters on the distribution of temperature field is analyzed. The variation of temperature field during cooling and solidification is studied, and the heat flux transfer law in induction casting process is explored, which provides the basis for the analysis of molten pool. On the basis of the verified temperature field model, the induction molten pool model is established to study the variation of molten pool morphology and the rules of molten pool movement during heating and cooling, and to calculate the distribution characteristics of temperature field inside the molten pool. The flow law of solute in molten pool was studied. In addition, the influence of process parameters on the cross section area of induction molten pool and the intensity of flow inside the molten pool is explored. Based on the study of molten pool and the calculation method of dilution rate of induction casting, the influence of single factor of process parameters on dilution rate is studied. By means of orthogonal test method, the residual stress value is set as the auxiliary target parameter, and the sensitivity of each factor to dilution rate is analyzed, and the better combination of factors is selected. Based on the experimental study of dilution law of induction melting casting, the control method of dilution rate is summarized and the process of induction casting is optimized.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG174.4

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