Wok bilong 'Vacuum Induction Melting' (VIM) insait long wok bilong wokim ol paip

Long wok bilong wokim ol paip, 'vacuum induction melting' (VIM) em i wanpela bikpela samting long redim ol samting bilong wokim ol 'high-end paip olsem ol 'nickel-based alloys' na 'titanium alloys'. Long rot bilong bungim 'high-temperature melting wantaim wanpela 'vacuum environment', em inap long winim planti mak: namba wan, em inap long bosim gut 'alloy composition'. Em i save meltim ol 'metal raw materials' long rot bilong hatim ol wantaim wanpela 'electromagnetic field', putim ol 'alloying elements' stret, bosim gut ol samting (wantaim asua bilong liklik o wankain olsem 0.05%), abrusim ol pipia olsem S na P (wantaim liklik o wankain olsem 0.01%), na mekim ol samting i stap wankain; namba tu, em inap long rausim ol ges na ol pipia we i save pairap. Insait long wanpela vekim envairomen we i liklik o wankain olsem 10−3 Pa, em i save rausim ol ges olsem H₂, N2, na O₂ (wantaim H₂ i liklik o wankain olsem 1ppm na O i liklik o wankain olsem 50ppm) na tu, em i save rausim ol 'impurities' long liklik -, bilong ol hul na ol liklik hul long taim bilong hat wok bilong prosesim ol paip, na daunim ol 'oxide' insait long en bilong helpim 'fatigue life'; namba tri, em inap long daunim 'secondary pollution'. Klostu 'vacuum' envairomen i save rausim ol samting bilong win na 'furnace lining', na i save abrusim kamap bilong ol 'nitride' na 'oxide' inklusen; namba foa, em i putim as bilong wok bihain. Em i yusim 'induction stirring' long mekim 'composition' na 'temperature' bilong 'melt' i wankain, daunim 'component segregation', stretim ol 'ingot grains' (kirap long mm level i go long μm level) long rot bilong bosim 'cooling rate', na mekim 'hot working plasticity' i kamap gutpela moa.