30Cr15MoY alloy steel powder for laser additive manufacturing or remanufacturing and using method of 30Cr15MoY alloy steel powder

Abstract

The invention discloses novel 30Cr15MoY alloy steel powder for laser additive manufacturing or remanufacturing and a preparation method of the novel 30Cr15MoY alloy steel powder. The 30Cr15MoY alloy steel powder is prepared from 0.25-0.35% of C and 14.5-15.5% of Cr, has the characteristics of medium C content and high Cr content, and has the oxygen content of 0.05% or below, the sphericity degreeof 99% or above, the hollow sphere rate of 1% or below, the apparent density of 4.5-4.95g / cm<3> and the fluidity of 15-15.5s / 50g. The average microhardness of a 30Cr15MoY alloy steel formed part sample prepared through laser additive manufacturing is 370-430 HV, the tensile strength is 1090-1300MPa, the yield strength is 800-980MPa, the elongation percentage is 7-14%, and high strength and toughness matching performance is achieved. The average microhardness of a 30Cr15MoY alloy steel coating sample prepared by laser remanufacturing is 650-750HV, the tensile strength is 1007-1438MPa, the wearrate is 6*10<-6>-8*10<-6>mm<3> / (N.m), the corrosion current density is 1.93*10<-7>-5.6*10<-7>A.cm<-2>, the corrosion voltage is -221 to -576mV, and the characteristics of wear-resistant and corrosion-resistant alloy samples are realized. The alloy steel powder disclosed by the invention has wide application prospects in the fields of laser additive manufacturing for preparing formed parts and laser remanufacturing for repairing worn, corroded and failed parts.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing or remanufacturing metal, and in particular relates to a spherical 30Cr15MoY alloy steel powder for laser additive manufacturing or remanufacturing and a laser printing method thereof. Background technique [0002] In recent years, with the wide application of laser additive manufacturing or remanufacturing technology in the field of manufacturing and remanufacturing key metal parts, such as laser direct manufacturing (3D forming) high-speed rail brake discs, nuclear power emergency camshafts and other parts and laser remanufacturing There is a huge demand for high-performance alloy steel powder for laser additive manufacturing and remanufacturing of key components such as roller boxes, tie rods, and racks for cladding repair of short-stress line rolling mill failures in the metallurgical industry. At present, domestic and foreign studies on titanium alloy, cobalt-based alloy,...

AI Technical Summary

Problems solved by technology

Alloy composition is one of the key factors that determine the structure and performance of key metal parts in laser additive manufacturing and remanufacturing. For low-carbon and low-alloy alloy steel systems, their hardness is generally low (300-400HV), which cannot meet the requirements of high hardness and high resistance. The performance requirements of grinding parts; for high-C, high-alloy and other complex wear-resistant alloy steel systems, due to the typical phase transition stress and thermal stress in the cladding layer, it is easy to be used in laser additive manufacturing and remanufacturing with high hardness and high hardness. Wear-resistant alloy steel parts or coatings have defects such as cracks and deformations, thus losing their use value. At the same time, high carbon content will also have an adverse effect on the corrosion resistance of alloy steel; Adverse effect of small high carbon content on corrosion resistance

The traditional high-hardness and high-wear-resistant alloy steel powder widely used in the market is mainly based on the method and theory of balanced metallurgy for its composition design. When alloy steel powder is used for laser additive manufacturing and remanufacturing, there are often scientific problems such as poor powder printability, easy deformation and cracking, poor toughness matching, poor mechanical properties, and wear resistance and corrosion resistance that cannot meet the needs.

[0004] In response to the above scientific problems, on the basis of 15Cr13MoY alloy steel, closely combined with the forming characteristics of laser additive manufacturing and remanufacturing technology non-equilibrium metallurgy, the innovative design is suitable for laser additive manufacturing and remanufacturing with high corrosion resistance and high wear resistance medium carbon The composition of alloy steel solves the problems of poor formability (deformation, cracking) and unsatisfactory material properties in the powder laser forming process of the traditional alloy composition system, so as to meet the current market demand for high corrosion resistance and high wear resistance for laser additive manufacturing and remanufacturing The demand for alloy steel powder lays the material foundation for laser additive manufacturing and remanufacturing to repair key parts of high corrosion-resistant and high-wear-resistant alloy steel

[0005] Laser additive manufacturing and remanufacturing 24CrNiMoY, 12CrNi2RE, 50Cr6Ni2Y and other alloy steel powders have a hardness of 300-500HV, a tensile strength of 900-1200MPa, and an elongation of 8-12%, which can meet the wear-resistant parts, high-speed rail brake discs and nuclear power emergency The performance requirements of the core material of the diesel camshaft, according to the actual service conditions, the hardness of the surface working layer of the high-speed rail brake disc, nuclear power emergency diesel camshaft and short stress line rolling mill failure key parts must reach 600-900HV, and It has good wear resistance and corrosion resistance. However, there is no high-performance alloy steel powder suitable for laser additive manufacturing and remanufacturing of high-hardness, high-wear and corrosion-resistant working layers to meet the high wear resistance and corrosion resistance of key parts. High corrosion resistance service performance requirements, so as to achieve the goal of laser additive manufacturing and remanufacturing of high-performance key components

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