作　　者： ; ; ; ;

机构地区： 中南大学材料科学与工程学院粉末冶金国家重点实验室

出　　处： 《中国有色金属学报》 2010年第6期1143-1148,共6页

摘　　要： 采用X射线衍射(XRD)、扫描电镜(SEM)和能谱分析、差示扫描量热法(DSC)分析、金相观察和显微硬度测定,研究铁基合金Fe-14Cr-3W-5Ti-3Y-2.2O(质量分数,%)中氧化物弥散相的形成和演化过程,以及氧化物弥散相对铁基合金的强化作用。结果表明:在高能球磨过程中,TiH2、YH2和Fe2O3可以在雾化粉末Fe-14Cr-3W基体中充分固溶;在随后的压制、烧结过程中,当烧结温度为950℃时弥散相以Ti2Y2O7相的形式析出,其强化作用不明显,合金的显微硬度只有250HV;当烧结温度为1100℃时,烧结体致密度得到提高,弥散相强化效果显著,合金的显微硬度为798HV;随着烧结温度的提高,析出相粒子长大,合金的显微硬度降低。 The formation,evolution and the enhancing effects of the oxide strengthening phase on the iron-based alloy Fe-14Cr-3W-5Ti-3Y-2.2O（mass fraction,%） were studied by X-ray diffractometry,scanning electron microscopy,energy spectrum analysis,DSC analysis,optical microscopy and microhardness test.The results show that,during the mechanical alloying process,TiH2,YH2 and Fe2O3 can dissolve in the atomized powder Fe-14Cr-3W.The Ti2Y2O7 phase will precipitate at 950℃during the following pressing and sintering processes,the enhancing effects are not obvious and the microhardness is about 250HV.When sintered at 1 100℃,the compactness of the sintered alloy increases,the enhancing effects of the oxide strength phase are improved,and the microhardness increases to 798 HV by the dispersion phase.The precipitation phase grows and the microhardness decreases with increasing sintering temperature.

关 键 词： 铁基高温合金 氧化物析出相 弥散强化

领　　域： [冶金工程] [冶金工程]