Deformation high-temperature alloy capable of forming composite corrosion-resistant layer and preparation process of deformation high-temperature alloy

Abstract

The invention discloses a deformation high-temperature alloy capable of forming a composite corrosion-resistant layer and a preparation process of the deformation high-temperature alloy. The deformation high-temperature alloy is prepared from the components in percentage by mass: 16-19% of Cr, 10-15% of Co, 0.5-1.5% of Ti, 3.5-4.5% of Al, less than or equal to 0.5% of W, less than or equal to 5.0%of Mo, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 0.5-1.0% of Nb, 0.04-0.07% of C and the balance of Ni. The preparation process comprises the steps of homogenization treatment after smelting; hot rolling; and final heat treatment. The room temperature and 850 DEG C tensile yield strengths of the alloy are higher than 820 MPa and 520 MPa correspondingly, meanwhile, the deformation high-temperature alloy has excellent processing performance and tissue stability, no harmful phase is separated out during heat exposure of 850 DEG C, and the room temperature and 850 DEG Ctensile yield strengths after heat exposure for 1350 h under the temperature are higher than 630 MPa and 370 MPa correspondingly.

Description

technical field [0001] The invention belongs to the field of high-temperature alloys, and specifically relates to a deformed high-temperature alloy capable of forming a composite corrosion-resistant layer and a preparation process thereof. Cold stack key components, etc. Background technique [0002] As my country's electricity demand continues to increase, energy shortages and environmental pollution problems have become increasingly prominent, and the need to develop high-efficiency, energy-saving, and environmentally friendly power generation methods has become increasingly urgent. Thermal power generation has been the most important power generation technology in my country for a long time, and improving the steam parameters of the unit is considered to be the most effective way to solve the above problems. A lot of practice in the past has shown that the service performance of materials is the most important factor restricting the improvement of steam parameters of boi...

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Problems solved by technology

However, the addition of Mo element is not conducive to the coal ash corrosion resistance of the alloy, so it is necessary to ensure that the alloy has sufficient content of corrosion-resistant elements such as Al and Cr

However, pure Al 2 o 3 The layer is unstable in the coal ash corrosion environment, so the alloy needs to ensure sufficient Cr content, but this will also cause problems such as the nucleation of the Z phase at the grain boundary

Therefore, it is also necessary to adjust the amount of Nb element reasonably to improve the Ni 3 While maintaining the stability of Al(γ’), it avoids the precipitation of harmful phases at the grain boundary and damages the processing performance of the alloy due to its excessive addition

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