Iron-based alloy powder used for laser manufacturing of high-speed railway switch bedplates

Abstract

The invention discloses an iron-based alloy powder used for laser manufacturing of high-speed railway switch bedplates. The iron-based alloy powder comprises, by mass, 1.0-1.2% of C, 12-15% of Cr, 3-4.8% of W, 1-2% of Ti, 4-6% of Ni, 2.1-4.1% of B, 0.2-0.3% of Si, 0.1-0.15% of Y2O3, 0.12-0.19% of Hf, and the balance of Fe. The proportions of all elements are adjusted to improve the crack resistance, the formability, the technologic stability and the component uniformity of the alloy powder in a laser cladding layer in order to meet the high-speed railway switch bedplates' requirements of the corrosion resistance, the wear resistance, the fatigue resistance and other comprehensive performances.

Description

technical field [0001] The invention relates to an alloy powder material suitable for laser cladding, in particular to an iron-based alloy powder used for laser manufacturing of high-speed railway turnout platform. Background technique [0002] High-speed railway construction is a major project and major project for my country to start vigorously developing domestic demand. The turnout platform is an important component in the construction of high-speed passenger dedicated lines with a length of more than 250 kilometers. The construction of high-speed railways puts forward strict requirements on the wear resistance and corrosion resistance of the platform. [0003] At present, the mainstream manufacturer of high-speed railway construction in the world is Alstom of France. The table is usually made of integral stainless steel or low-carbon steel plated with hard chromium coating. The construction of high-speed railway networks in economically developed regions such as the Uni...

AI Technical Summary

Problems solved by technology

These mixed alloy powders have problems such as uneven mixing, large particle size differences, different melting points, compositional deviations, and different expansion coefficients, which lead to defects such as cracks, pores, segregation, unstable performance, and difficult machining in actual cladding.

[0009] Although some alloy powders used for laser cladding can achieve certain technical effects on specific equipment parts, due to their own process characteristics, they cannot meet and apply to the process requirements of laser cladding of other specific substrates, especially cannot To meet the crack resistance, formability, process stability and composition uniformity of the alloy powder in the laser cladding layer, but also to meet the requirements for the corrosion resistance and wear resistance of the cladding layer

[0010] Therefore, researching and developing a new iron-based alloy powder for laser cladding with wear resistance and corrosion resistance and stable performance is a major topic in the technical field. After searching and checking by the applicant: there is no such aspect at home and abroad related reports