Alloy powder capable of producing compression stress in the fused-on layer

Abstract

The alloy powder capable of producing compression stress in the fused-on layer consists of Cr 6.0-12.0 wt%, Ni 5.0-11.0 wt%, Mn 0.5-1.8 wt%, Mo 0.1-0.9 wt%, Nb 0.1- 0.9 wt%, Ti 0.1-0.9 wt%, Si 0.1-0.9 wt%, except Fe. It has grain size of 50-200 microns, solid phase change temperature after melting and solidifying of 100-300 deg.c, and structure comprising martensite in 50-90 % and austenite in 10-50 %. The present invention is used in raising the fatigue resistance, stress corrosion resistance, safety and service life of iron and steel material, mechanical structure and equipment. The method and material of the present invention may be used in producing composite material product with compression stress in the surface.

Description

technical field [0001] The invention relates to an alloy powder, in particular to an alloy powder suitable for processes such as spray coating, spray welding, spray melting and remelting. Background technique [0002] By the end of 2005, my country's steel output was close to 300 million tons, 80-90% of which was used to manufacture large metal structures and equipment, which played an important role in improving people's living standards and social progress. However, large-scale metal structures and equipment often have failure problems, causing huge economic losses and even personal casualties. Therefore, their reliability and safety have always been a concern of people. [0003] Fracture, corrosion, and wear are the three main forms of metal structure failure. In order to reduce the failure loss caused by this, many methods of surface modification of metal materials have been proposed, such as: spray coating, spray welding, spray melting and remelting, etc. There are sev...

AI Technical Summary

Problems solved by technology

However, after actual manufacturing and processing, there will be high levels of tensile stress locally in the metal structure, or additional tensile stress caused by stress concentration. After superimposed working loads, cracks will appear in these parts, especially fatigue cracks and stress corrosion cracks. Causes premature failure of metal structures

It is possible to alleviate some stress concentration problems by using the above-mentioned process methods, but for failure problems mainly caused by fracture, these methods are helpless, but will cause greater tensile stress on the surface of the structure

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