Dab tsi yog qhov zoo tshaj plaws superalloy?
Superalloys are heat-resistant alloys of nickel, iron-nickel, and cobalt that can be used at high temperatures, typically >70% ntawm lawv melting kub. Lawv tuaj yeem siv rau qhov kub thiab txias tshaj 1050 degree, mus txog 1200 degree. Qhov ntsuas kub no ua rau nws hloov tau zoo rau tungsten carbide hauv daim ntawv thov tuaj tos.
The most widely used type of superalloy is nickel-based, which contains high concentrations of chromium, iron, titanium, cobalt and other alloying elements. Like other groups of metallic materials, the properties of superalloys can be tuned through various heat treatments and/or annealing and quenching. High-temperature alloys have the highest maximum service temperatures and the highest hardness values compared to other material groups. The strength of superalloys makes them an excellent alternative to carbide in high bonding force applications (>1 kg).
Inconel alloy 718 muaj qhov siab tshaj plaws hardness, tab sis muaj qhov kub siab tshaj qhov kev pab cuam tshaj li lwm cov khoom kub kub xws li Incoloy 925, Nitronic 60 thiab Stellite 31. Qhov feem ntau siv superalloy yog alloy 718, uas suav rau ntau tshaj 50% ntawm superalloys siv niaj hnub no. Alloy 718 yog qhov kev xaiv nrov rau cov cuab yeej siv hauv kev thov nti txuas daim ntawv thov.
Lwm cov qib siab kub alloy siv hauv peb cov khoom lag luam yog Nitronic thiab Stellite. Nitronic 60 muaj kev sib xyaw ua ke zoo tshaj plaws ntawm kev ua haujlwm siab (txog HRC 46) thiab kev pabcuam siab tshaj plaws. (980 degree). Nitonic 60 yog lub npe hu rau nws cov khoom tiv thaiv zoo heev.
Stellite® superalloys yog cov alloys ntawm cobalt thiab chromium, nrog rau lwm cov ntsiab lus uas txhim kho cov khoom siv hlau rau cov kev siv tshwj xeeb. Cov ntsiab lus carbon ntawm Stellite alloys muaj kev cuam tshuam zoo rau nws cov khoom. Piv txwv li, Stellite 6 muaj cov ntsiab lus carbon ntau dua li Stellite 31 (1.2% vs. 0.5%). Piv rau Stellite 31, Stellite 6 muaj qhov tawv tawv dua tab sis qis dua qhov kev pabcuam kub siab tshaj. Stellite 31 yog lwm txoj hauv kev zoo tshaj plaws rau carbide thaum siv los ua cov khoom siv hauv paus rau dispensing nozzles thiab stamping cov cuab yeej hauv peb cov tshuab nplaum.
