【摘要】 采用金相显微镜、扫描电镜、透射电镜、化学相分析等方法对ＺＧ４０Ｃｒ２５Ｎｉ２０（２５－２０合金）、ＺＧ４０Ｃｒ２５Ｎｉ３５ＮｂＷ（２５－３５合金）和ＺＧ４５Ｃｒ２８Ｎｉ４８Ｗ５（２８－４８合金）离心铸管的组织进行了系统研究。结果表明，２５－２０合金的铸态组织为γ、γ＋Ｍ７Ｃ３共晶和Ｍ２３Ｃ６，经８７０℃×２０ｈ时效后Ｍ７Ｃ３转变为Ｍ２３Ｃ６，晶内析出颗粒状Ｍ２３Ｃ６；２５－３５合金铸态和９８２℃×２０ｈ时效后组织均为γ＋Ｍ２３Ｃ６＋ＮｂＣ；２８－４８合金铸态为γ和γ＋Ｍ２３Ｃ６共晶以及颗粒状Ｍ６Ｃ，９８２℃×２０ｈ时效后析出大量颗粒状和条状Ｍ２３Ｃ６和Ｍ６Ｃ。更多还原

【Abstract】 A systematic investigation has been carried out on the structure of centrifugally cast ZG40Cr25Ni20(2520),ZG40Cr25Ni35NbW(2535) and ZG45Cr28Ni48W5(2848) tubes with metalloscopy, SEM, TEM and chemical phase analysis etc It is shown that the cast structure of alloy 2520 consists of , eutectic carbide(+M7C3)and M23C6 and after 20hr ageing at 870 , M7C3 carbide transforms into M23C6, a large amount of M23C6 particle is precipitated within the grains For alloy 2535, the structure consists of ,M23C6 and NbC both as cast and through 20hr ageing at 982 For alloy 2848, the structure consists of , eutectic carbide(+M7C3) and M6C particulate carbide, through 20 hr ageing at 982 ,a large amount of particulate and strip carbide of M23C6 and M6C is precipitated更多还原