论文部分内容阅读
利用电子能量为127 keV、能量密度为34 J/cm~2、脉冲宽度为180 ns的强流脉冲电子束(IPEB)对WC-13Ni硬质合金的表面进行1~10次的辐照处理。利用XRD、SEM和EPMA等测试方法研究了IPEB辐照前后WC-Ni硬质合金表层相组成、表面形貌和元素分布的变化,借助显微硬度计和环-块式磨损仪测试了辐照前后硬质合金表层的性能。结果表明:IPEB辐照使硬质合金表面发生快速重熔和Ni粘结相择优烧蚀,导致α-WC相向β-WC_(1-x)和α-W_2C亚稳相转变;同时,辐照诱发的应力波的冲击作用使硬质合金表层深度硬化,硬化层深度可达210~380μm。IPEB辐照显著降低了硬质合金的摩擦因数和磨损率,10次辐照分别降低约32%和64%,这由于IPEB辐照硬质合金表层组织重熔细化和深层硬化。
The surface of WC-13Ni cemented carbide was irradiated by irradiation for 1 to 10 times with a pulsed electron beam (IPEB) of 127 keV, an energy density of 34 J / cm 2 and a pulse width of 180 ns. The phase composition, surface morphology and elemental distribution of WC-Ni cemented carbide before and after IPEB irradiation were studied by means of XRD, SEM and EPMA. The effects of irradiation Carbide surface layer before and after the performance. The results show that IPEB irradiation causes rapid remelting on the cemented carbide surface and selective ablation of Ni bonds, resulting in the metastable phase transition of α-WC to β-WC_ (1-x) and α-W_2C. At the same time, Induced stress wave impact so that the depth of the cemented carbide surface hardening depth of up to 210 ~ 380μm. IPEB irradiation significantly reduced the coefficient of friction and wear rate of cemented carbides, which was reduced by about 32% and 64%, respectively, due to the remelting and deep hardening of the surface tissue of IPEB irradiated cemented carbide.