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机械合金化和SPS工艺制备9CrWTi-Y2O3/铁素体-马氏体钢

, PP. 142-148

Keywords: 放电等离子体烧结,收缩曲线,热处理,铁素体-马氏体钢

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Abstract:

采用机械合金化(MA)和放电等离子体烧结(SPS)工艺制备了9CrWTi-0.35%Y2O3氧化物弥散强化铁素体-马氏体钢(9CrWTi-0.35%Y2O3/FMs)。利用SPS温度和位移测量装置、OM、FE-SEM、TEM、EDX表征了材料烧结收缩曲线及热处理前后的显微组织和成分,并采用电子拉伸试验机测试了室温拉伸性能。结果表明:9CrWTi/FMs和9CrWTi-0.35%Y2O3/FMs在烧结过程出现液相烧结特征。提高烧结温度和压力,9CrWTi-0.35%Y2O3/FMs孔隙度减小,密度提高,晶粒变细,抗拉强度增加,但延伸率仅为2%左右。富集Y—Ti—O的弥散相颗粒大小为5~20nm,较均匀地分布在基体上。9CrWTi-0.35%Y2O3/FMs烧结态、10%盐水淬火态及750℃高温回火态的显微组织分别为等轴铁素体、细长板条马氏体及等轴和残余铁素体。9CrWTi-0.35%Y2O3/FMs烧结体经盐水淬火、回火后,抗拉强度、屈服强度和总延伸率由1554MPa、1430MPa、1.8%变为1198MPa、1006MPa和12.8%。

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