本文選題：激光深熔焊 + 光線追蹤法��； 參考：《材料熱處理學(xué)報(bào)》2015年07期

【摘要】：為了準(zhǔn)確的模擬出激光深熔焊接中小孔的動態(tài)變化過程,根據(jù)小孔內(nèi)激光的能量吸收機(jī)制,采用Particle Level Set方法和有限差分模型的光線追蹤法來描述小孔對激光能量的吸收作用,建立了描述激光深熔焊接過程中熔池動態(tài)行為和小孔瞬態(tài)演化行為的三維數(shù)值模型。動態(tài)模型中考慮了菲涅耳吸收、蒸發(fā)潛熱、凝固/熔化潛熱和熔池內(nèi)液態(tài)金屬的耦合對流傳熱等物理因素,以及反沖壓力、表面張力和熱毛細(xì)力等力學(xué)因素的影響。通過對30Cr Mn Si A鋼激光焊接過程的數(shù)值模擬,得到了動態(tài)焊接過程中小孔深度的變化規(guī)律和小孔的形貌特征、能量分布特征。研究表明,小孔動態(tài)演化過程可分為3個階段:小孔深度線性增長階段、振蕩增長階段和高頻振蕩階段。不同階段小孔的振蕩方式和程度不同,進(jìn)而造成小孔的形貌和孔壁的能量密度分布也不同。而小孔的振蕩也是焊接不穩(wěn)定性和缺陷形成的重要原因。
[Abstract]:In order to accurately simulate the dynamic process of the small hole in laser deep penetration welding, according to the energy absorption mechanism of the laser in the hole, the Particle level set method and the ray tracing method of the finite difference model are used to describe the absorption of the laser energy by the small hole. A three dimensional numerical model is established to describe the dynamic behavior of molten pool and the transient evolution of holes during laser deep penetration welding. The physical factors, such as Fresnel absorption, latent heat of evaporation, solidification / melting latent heat, coupled convection heat transfer of liquid metal in molten pool, as well as mechanical factors such as recoil pressure, surface tension and thermal capillary force, are considered in the dynamic model. Through the numerical simulation of the laser welding process of 30Cr mn Si A steel, the variation law of the hole depth and the characteristics of the morphology and energy distribution of the holes in the dynamic welding process are obtained. The results show that the dynamic evolution of the pores can be divided into three stages: the linear growth stage of pore depth, the stage of oscillation growth and the stage of high frequency oscillation. The shape of the pore and the distribution of the energy density of the pore wall are also different due to the different oscillation modes and degrees of the pore at different stages. The oscillation of small hole is also an important reason of welding instability and defect formation.
【作者單位】： 中國工程物理研究院總體工程研究所;華中科技大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：中國工程物理研究院重大基金(2013A0203008) 中國工程物理研究院“計(jì)算固體力學(xué)”重點(diǎn)學(xué)科項(xiàng)目
【分類號】：TG456.7

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