(西北工業(yè)大學(xué) 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，西安 710072)
摘 要: 采用電磁場(chǎng)近液相線處理工藝對(duì)Ni-Cr-W高溫合金熔體進(jìn)行處理，然后澆鑄，可獲得整體均勻細(xì)小等軸晶鑄錠。建立不同質(zhì)量Ni-20Cr-18W高溫合金熔體電磁場(chǎng)近液相線熔體處理溫度場(chǎng)有限元模型，分析電流頻率和加熱功率等感應(yīng)加熱工藝參數(shù)及合金質(zhì)量對(duì)熔體溫度場(chǎng)分布的影響。給出了一定質(zhì)量的合金熔體整體均勻保溫在液相線附近時(shí)所對(duì)應(yīng)的最優(yōu)工藝參數(shù)，得到了熔體質(zhì)量與對(duì)應(yīng)的最優(yōu)加熱功率間的經(jīng)驗(yàn)關(guān)系式。最優(yōu)電流頻率為200 Hz。研究結(jié)果可為優(yōu)化高溫合金近液相線熔體處理工藝參數(shù)提供依據(jù)。
關(guān)鍵字: Ni-Cr-W高溫合金；近液相線鑄造；熔體處理；有限元模擬
（State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:When the Ni-Cr-W superalloy melt was held at near liquidus under electromagnetic field and poured into ingot molds, some ingots with uniform fine equiaxed grains can be obtained. The finite element models of temperature field about different masses of Ni-20Cr-18W superalloy melts treated by induction electromagnetic field were established. The effects of the induction melting process parameters such as current frequency, heating power and the mass of the superalloy melt on the distribution of melt temperature field were investigated. The optimal parameters for holding a certain mass of superalloy melt at near liquidus were obtained. An empirical formula of relationship between the mass of superalloys and optimal heating power was established. The optimal current frequency is 200 Hz. The research results provide a useful support for optimizing the induction melting process parameters for near liquidus melt treatment.
Key words: Ni-Cr-W superalloy; near liquidus casting; melt treatment; finite element simulation
