摘要
采用无压熔渗的方法,在熔渗温度为1210℃和熔渗时间为1.5 h的条件下,研究添加Cr_(3)C_(2)(0.0、0.2%、0.4%、0.6%、0.8%和1.0%,质量分数)对WC-Cu-10Ni-5Mn-3Sn硬质合金微观结构及力学性能的影响。结果表明:在熔渗过程中,WC发生部分分解,随着Cr_(3)C_(2)的添加,合金中出现Ni_(2)W_(4)C和Cr_(7)C_(3),Cr_(7)C_(3)易吸收WC分解产生的W形成(W,Cr)Cx和(Cr,W)C。出现的新相引起WC晶粒尺寸的变化,进而改变了合金的力学性能。随着添加Cr_(3)C_(2)质量分数的增加,硬度和抗弯强度呈现先上升后下降的趋势,当Cr_(3)C_(2)质量分数分别为0.4%和0.6%时,合金的硬度和抗弯强度达到了最大值,分别为HRA 93.1和1720 MPa。添加Cr_(3)C_(2)不利于合金冲击韧性的提高,未添加Cr_(3)C_(2)的合金具有最高的冲击韧性(4.65 J·cm^(-2))。
The WC-Cu-10Ni-5Mn-3Sn cemented carbide doped with Cr_(3)C_(2)was prepared by pressureless melt infiltration at 1210℃ for 1.5 h,the effect of Cr_(3)C_(2)dopant(0.0,0.2%,0.4%,0.6%,0.8%,and 1.0%,mass fraction)on the microstructure and mechanical properties of the WC-Cu-10Ni-5Mn-3Sn alloys was investigated.The results show that during the infiltration process,the WC particles partially decompose with the addition of Cr_(3)C_(2),the Ni_(2)W_(4)C and Cr_(7)C_(3)appear in the alloys,and the(W,Cr)Cx and(Cr,W)C are formed from Cr_(7)C_(3)and W produced by the decomposition of WC.The emergence of new phases causes the change in WC grain size,thereby altering the mechanical properties of the alloys.With the mass fraction increase of Cr_(3)C_(2),the hardness and flexural strength show the trend of first increasing and then decreasing.When the mass fraction of Cr_(3)C_(2)is 0.4% and 0.6%,respectively,the hardness and flexural strength reach the maximum,which is HRA 93.1 and 1720 MPa,respectively.The addition of Cr_(3)C_(2)is not conducive to the impact toughness,the alloys without Cr_(3)C_(2)have the highest impact toughness as 4.65 J·cm^(-2).
作者
党晓明
周新文
王岗
史振琦
刘宏亮
李晶
DANG Xiaoming;ZHOU Xinwen;WANG Gang;SHI Zhenqi;LIU Hongliang;LI Jing(Jinduicheng Molybdenum Co.,Ltd.,Xi’an 710077,China)
出处
《粉末冶金技术》
北大核心
2025年第6期753-760,共8页
Powder Metallurgy Technology
