Microstructure and Tensile Properties of 9Cr Oxide Dispersion Strengthened Steel Prepared at Different Ball Milling Time Intervals
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摘要: 采用雾化法制备Fe-9Cr-1.5W-0.3Ti-0.3Y合金粉,经不同时间(12,20 h)球磨处理后,使用热等静压工艺制备9Cr氧化物弥散强化(ODS)钢,研究了9Cr-ODS钢的显微组织与拉伸性能。结果表明:雾化合金粉末为规则球状α-Fe相合金粉,平均粒径为47.83 μm,晶粒尺寸约为20 μm;球磨20 h后,合金粉末的平均粒径和晶粒尺寸均明显下降,分别为30.50 μm,12 nm;随着球磨时间的延长,制备的9Cr-ODS钢的晶粒尺寸减小,析出相含量增加;延长球磨时间有利于提高9Cr-ODS钢的室温和高温抗拉强度,但不利于提高高温韧性。
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关键词:
- 雾化合金粉末 /
- 9Cr氧化物弥散强化钢 /
- 显微组织 /
- 拉伸性能
Abstract: Fe-9Cr-1.5W-0.3Ti-0.3Y alloy powder was prepared by atomization method and then was subjected to ball milling for different time intervals. 9Cr oxide dispersion strengthened (ODS) steel was prepared by hot isostatic pressing with the alloy powder as raw materials. The microstructure and tensile properties of the 9Cr-ODS steel were studied. The results show that the atomized alloy powder was a regular spherical α-Fe alloy powder with average particle size of 47.83 μm and grain size of about 20 μm. After ball milling for 20 h, the average particle size and grain size of the alloy powder decreased significantly to 30.50 μm and 12 nm, respectively. With the extension of milling time, the grain size of 9Cr-ODS steel decreased and the content of precipitated phase increased. Prolonging ball milling time was beneficial to improve the room temperature and high temperature tensile strength of the 9Cr-ODS steel, but not conducive to improving the high temperature toughness. -
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