1)chill zone with mottle,有麻口冷硬层2)chill zone without mottle,无麻口冷硬层3)chill mottle control,冷硬麻口控制法4)reverse mottle,冷子管冷硬麻口(展性铸铁铸疵)5)cooling hard layer,冷硬层6)chill zone,冷硬层，冷硬区
用法和例句
Influence of cooling hard layer on titanium alloy conventional extrusion forming process;