發(fā)布時間：2018-04-09 17:03

  本文選題：激光熔覆　切入點：數(shù)值模擬　出處：《應(yīng)用激光》2017年01期

【摘要】：利用有限元分析軟件SYSWELD建立了三維有限元模型,對不同預(yù)熱溫度下激光熔覆鐵基涂層的過程進(jìn)行了數(shù)值模擬,分析了不同預(yù)熱溫度下溫度場和組織轉(zhuǎn)變的變化規(guī)律,研究了冷卻速度和組織轉(zhuǎn)變對殘余應(yīng)力場的影響。結(jié)果表明,預(yù)熱溫度越高,熔覆層中心的峰值溫度越高,同時能有效降低熔覆層冷卻速度。預(yù)熱溫度在20~300℃范圍內(nèi)時,隨著預(yù)熱溫度的增加,熔覆層貝氏體含量逐漸增加,鐵素體和馬氏體含量逐漸減少,使得熔覆層殘余應(yīng)力增大;預(yù)熱溫度高于300℃以后,隨預(yù)熱溫度增加冷卻速度顯著降低,組織中鐵素體含量逐漸增加,貝氏體含量逐漸減少,殘余應(yīng)力隨之減小。
[Abstract]:A three-dimensional finite element model was established by using the finite element analysis software SYSWELD. The process of laser cladding iron-base coating at different preheating temperatures was numerically simulated, and the variation law of temperature field and microstructure transformation under different preheating temperatures was analyzed.The effects of cooling rate and microstructure transformation on residual stress field were studied.The results show that the higher the preheating temperature, the higher the peak temperature of the cladding core, and the lower the cooling rate of the cladding layer is.When the preheating temperature is in the range of 20 ~ 300 鈩，

本文編號：1727337