纳米 ZrC 粉末对 90W−7Ni−3Fe 合金组织及性能影响

苏旭文; 何志; 闫树欣; 董龙龙; 孙国栋

doi:10.19591/j.cnki.cn11-1974/tf.2023040009

纳米 ZrC 粉末对 90W−7Ni−3Fe 合金组织及性能影响

Effect of nano-ZrC powders on microstructure and properties of 90W−7Ni−3Fe alloys

摘要

摘要: 为了有效抑制液相烧结下钨晶粒长大，通过1500 ℃液相烧结制备了ZrC弥散强化重钨合金（WHAs），分析了ZrC质量分数（1%、2%）对WHAs组织以及性能的影响。结果表明，随ZrC质量分数的增加，WHAs相对密度和W−W连接度下降，钨晶粒得到一定程度的细化。当ZrC质量分数为1%时，WHAs强塑性匹配效果最好，合金的相对密度达到了98.4%，钨晶粒尺寸为22.17 μm，屈服强度和抗压强度（40%变形量）分别达到了791 MPa和2179 MPa，相比未添加ZrC的WHAs分别提升了8.35%和38.70%（730 MPa和1570 MPa）。

Abstract: To effectively inhibit the growth of tungsten grains during the liquid phase sintering, the ZrC dispersion-strengthened heavy tungsten alloys (WHAs) were prepared by liquid phase sintering at 1500 ℃. The effects of ZrC mass fraction (1% and 2%) on the microstructure and properties of WHAs were analyzed. The results show that, with the increase of ZrC mass fraction, the relative density and W−W contiguity of WHAs decrease, and the tungsten grains are refined to a certain extent. When the ZrC mass fraction is 1%, the strength-ductility matching effect of WHAs is the best, the relative density reaches 98.4%, the tungsten grain size is 22.17 μm, and the yield strength and compressive strength (40% deformation) reach 791 MPa and 2179 MPa, respectively, which are increased by 8.35% and 38.70%, compared with WHAs without ZrC (730 MPa and 1570 MPa).

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