MonelK500 alloy has excellent corrosion resistance, as well as higher strength and hardness than Monel400. This is because elements such as Al and Ti are added to the alloy, and after certain heat treatment, there are dispersed intermetallic compounds on the matrix. The organizational structure consists of a single-phase austenite structure and precipitation of dispersed Ni3 (Al, Ti) precipitates. The MonelK500 has approximately three times the yield strength and two times the tensile strength of Monel400, and higher mechanical properties can be achieved through cold work or age hardening. MonelK500 alloy has the same corrosion resistance as Monel400 alloy.
The friction weldability of Monel K500 nickel based high-temperature alloy has been studied, and it has been found that the friction weldability of Monel K500 alloy is excellent. Under the optimized friction welding process conditions in this article, Monel K500 alloy can obtain friction welding joints with 100% welding in the welding zone, good microstructure in the welded state, strength coefficient in the welding zone meeting the requirements, and high coaxiality accuracy of the welded parts.
Nickel ≥ 63.0
Iron ≤ 2.0
Manganese ≤ 1.5
Sulfur ≤ 0.01
Carbon ≤ 0.25
Silicon ≤ 0.5
The strengthening of high-temperature alloys can be summarized into three basic strengthening mechanisms: solid solution strengthening, second phase strengthening, and grain boundary strengthening. The typical structure of nickel based high-temperature alloys is mainly the alloyed austenite matrix and the dispersed strengthening phase in the matrix. The strengthening phase can be carbides or intermetallic compound phases. The supply status of nickel based high-temperature alloys is generally in solid solution+aging state, and sometimes in other states, such as rolling state, according to different usage requirements.