Effect of Tungsten on the Hardness and Impact Resistance of Ni-Hard 4 Cast Iron
The application of Ni-hard 4 cast irons are similar to high chromium cast irons but the characteristic which differs Ni-hard 4 cast iron from high chromium cast irons is its great hardenability. In the present research the effect of tungsten on Ni-hard 4 cast irons and its effect on the microstructure and formation of carbides are investigated. Also the aim of this research is to simultaneously increase the impact resistance and toughness. For this reason samples according to ASTM A532 standard were prepared without the addition of tungsten while the other samples were prepared by adding different percentages of tungsten to the melt by casting method. After the casting procedure; heat treatment, impact, macro-hardness and micro-hardness tests were done. Studies showed that the addition of tungsten leads to the increase in the hardness of the matrix phase and the formation of M7C3 carbides and it also increases the volume fraction of the carbides and decreases the average diameter of carbides. Due to these reasons the hardness and impact resistance simultaneously increase.
- حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران میشود.
- پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانههای چاپی و دیجیتال را به کاربر نمیدهد.