SU165548A1 - HEAT-RESISTANT ALLOY - Google Patents

Description

Heat-resistant alloys containing carbon, silicon, manganese, nickel, iron, chromium, tungsten, molybdenum, titanium, aluminum, boron are known. These alloys do not have long-term strength at a temperature of 700-800 ° C.

The proposed alloy differs from the known ones in that an increased amount of carbon is introduced into it and an aluminum-titanium ratio (of the order of 2) is taken, which preserves the plastic properties of the metal.

The alloy contains (in%): carbon 0.10-0.16, silicon up to 0.5, manganese up to 0.5, sulfur up to 0.025, phosphorus up to 0.025, chromium 14-16, molybdenum 3-5, tungsten 4-6 aluminum 1.7- 2.2, titanium 1.0-1.4, iron 3.0. Up to 0.01% boron is also allowed in the alloy.

Thermal treatment of products made from this alloy consists in quenching into oil from a temperature of 1150 ° C (holding at this temperature for about 3 hours and subsequent tempering at 800 ° C for 20 hours.

Heat-treated alloy has a long-term strength (for 10,000 hours) at 750 ° C 15-17 kg / mm.

The alloy was developed at the Central Research Institute of Technology and Mechanical Engineering and is intended for the manufacture of gas and steam turbines.

Subject invention

A heat resistant nickel base alloy with chromium, tungsten, molybdenum and aluminum, characterized in that

increasing the duration of its durability at a temperature of about 800 ° C, it contains (in%): carbon 0.10-0.16, silicon to 0.5, manganese to 0.5, chromium 14-16, molybdenum 3-5, tungsten 4-6, aluminum 1.7-2.2, titanium 1.0-1.4, iron 3.0, sulfur and phosphorus to 0.025 each.