93W-5Ni-2Fe高密度钨合金冲击韧性关键影响因素研究  

The Research of Key Factors for Impact Toughness of 93W-5Ni-2Fe Alloys

作　　者：甘杰[1] 何林[1] 李强[1] 杨晓峰[1] 范辉[1] GAN Jie;HE Lin;LI Qiang;YANG Xiaofeng;FAN Hui(Institute of Materials,China Academy of Engineering Physics,Mianyang 621907,China)

机构地区：[1]中国工程物理研究院材料研究所,绵阳621907

出　　处：《材料导报》2020年第S01期304-306,共3页Materials Reports

摘　　要：采用真空烧结技术制备了93W-5Ni-2Fe合金,研究了杂质元素、内部缺陷及表面加工应力对钨合金冲击韧性的影响。结果表明:杂质元素氧与钨、铁、镍等发生氧化反应,生成氧化钨和其他氧化物夹杂,破坏母体的连续性,导致钨合金性能的恶化;随着氧杂质元素含量的降低,钨合金冲击韧性得到大幅改善;过高的升温速率,容易在烧结坯内部产生大量的气孔等内部缺陷,严重影响其冲击韧性,采用较低的升温速度(3℃/min),有利于减少试样中气孔等内部缺陷的产生,改善试样的冲击韧性;真空热处理能够很好地消除试样表面的加工应力,提高材料的冲击韧性。93W-5Ni-2Fe alloys were prepared by vacuum sintering.The effects of impurities,defects and surface stress on impact toughness were stu-died.The results showed impurities of tungsten oxide and other oxides resulting from reactions between oxygen and tungsten,iron,nickel and etc deteriorated the properties of tungsten alloys significantly.With a decreasing content of oxygen,the impact toughness of tungsten alloys could be improved considerably.By using a heating rate of 3℃/min,few pores and defects were formed in alloys,which showed a good impact toughness.Whereas,by using exorbitant heating rate,a large amount of pores and defects were formed.Vacuum annealing could eliminate the surface stress of tungsten alloys effectively,resulting in an improve impact toughness.

关 键 词：钨合金 冲击韧性 氧含量 内部缺陷 真空热处理 表面应力 

分 类 号：TG146.4[一般工业技术—材料科学与工程]