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Influence of Annealing Time on Microstructure of Ni-W Alloys

机译:退火时间对Ni-W合金显微组织的影响

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The as-cast Ni-W alloys with 15wt%W,25wt%W and 30wt%W were annealed in hydrogen at 1100°C.The effect of the annealing time on the microstructure of Ni-W alloys was studied,and the phase constituents and microstructure of annealed Ni-W alloys were characterized by the X-ray diffraction (XRD) and scanning electron microscopy (SEM).The results showed that no any phase changed for Ni-15%W,Ni-25%W and Ni-30%W alloys annealed for 60 min,90 min and 150 min,which were still consisted of single-phase Ni(W) solid solution.However,microstructure had a significant change after annealing.With increase of annealing time,the microstructure of Ni-15%W alloy became more uniform after annealing for 90 min,and the average grain size was 95μm,whereas the grain size of Ni-15%W alloy increased significantly after annealing for 150 min.For Ni-25%W and Ni-30%W,there was no obvious change on the grain size with increase of annealing time,and the amount of oxides at grain boundaries gradually reduced.After annealing for 150 min,the impurities at grain boundaries almost disappeared.Subsequently,the annealing at 1100°C for 150 min was beneficial for the desired microstructure of Ni-25%W and Ni-30%W alloys.
机译:在1100°C的氢气中对15wt%W,25wt%W和30wt%W的铸态Ni-W合金进行退火。研究了退火时间对Ni-W合金显微组织的影响,并研究了相组成用X射线衍射(XRD)和扫描电子显微镜(SEM)对Ni-W合金的组织和显微组织进行了表征。结果表明,Ni-15%W,Ni-25%W和Ni- 30%W合金分别退火60min,90min和150min,仍由单相Ni(W)固溶体组成。但是,退火后,显微组织发生了显着变化。随着退火时间的增加,Ni的显微组织也发生了变化。 -15%W合金退火90分钟后变得更均匀,平均晶粒尺寸为95μm,而Ni-15%W合金退火150分钟后晶粒尺寸显着增加。Ni-25%W和Ni- 30%W时,退火时间增加,晶粒尺寸无明显变化,晶界处的氧化物逐渐减少。退火150min,晶界杂质几乎消失。随后,在1100℃下退火150min,有利于Ni-25%W和Ni-30%W合金的理想组织。

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