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A kind of wear-resistant steel for high-speed hammer head with double quenching and partitioning process and its preparation method
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A technology of quenching and distribution, wear-resistant steel, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of low-alloy wear-resistant steel, deterioration of toughness, low plasticity and toughness, etc., achieve high strength and toughness, improve comprehensive performance, and improve toughness and the effect of abrasion resistance
Active Publication Date: 2019-03-15
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
Chinese patent application CN200910227804.4 introduces a method for preparing a wear-resistant steel with a hardness of 50-53HRC by casting. The material composition is designed with more than 0.1wt% Re, which brings about an increase in cost and a long-term Low-temperature tempering can easily cause a small amount of residual austenite in the material to decompose into carbide and ferrite, resulting in deterioration of toughness. The elongation is 2.4-3.0%, and the plasticity and toughness are far lower than the double quenching in the present invention. Wear-resistant steel for high-speed hammer head in dispensing process
Chinese patent application CN201010575998.X introduces a method for preparing low-alloy wear-resistant steel by casting. The material is compounded with micro-alloying elements such as C, Si, Mn, Cr, B, Ce, etc., and is treated by oil-cooling quenching + tempering. A steel with tempered martensitic structure is obtained. Under the condition of not opening the gap, the impact energy is only 25-40J, the tensile strength is only 1100-1500MPa, and the mechanical properties are poor.
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Embodiment 1
[0029] First, smelt and cast according to the above composition range, and then detect the composition of the slab, see Table 1.
[0030] Table 1 Slab composition (wt.%)
[0031]
[0032] The specific heat treatment process parameters are shown in Table 2.
[0033] Table 2 heat treatment process parameters
[0034]
[0035] The mechanical properties of the wear-resistant steel for high-speed hammer heads prepared by double quenching and partitioning process according to Table 1 and Table 2 are shown in Table 3.
[0036] Table 3 mechanical properties
[0037]
[0038] According to Table 1 and Table 2, the wear-resistant steel for high-speed hammerheads prepared by double quenching and partitioning process was measured by XRD to measure the retained austenite volume fraction, the martensite phase volume fraction is 100% minus the retained austenite volume fraction, the result See Table 4.
[0039] Table 4 Content of different tissues
[0040]
[0041] It can be ...
Embodiment 2
[0043] First, smelt and cast according to the above composition range, and then detect the composition of the slab, see Table 5.
[0044] Table 5 Slab Composition (wt.%)
[0045]
[0046] The specific heat treatment process parameters are shown in Table 6.
[0047] Table 6 heat treatment process parameters
[0048]
[0049] The mechanical properties of the wear-resistant steel for high-speed hammer heads prepared by the double quenching and partitioning process according to Table 5 and Table 6 are shown in Table 7.
[0050] Table 7 mechanical properties
[0051]
[0052] According to Table 5 and Table 6, the wear-resistant steel for high-speed hammer head prepared by double quenching and partitioning process was measured by XRD to measure the retained austenite volume fraction, and the martensite phase volume fraction was 100% minus the retained austenite volume fraction, the result See Table 8.
[0053] Table 8 Content of different tissues
[0054]
[0055] I...
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Abstract
The invention discloses wear-resistant steel used for a high-speed hammer and prepared through a dual quenching and distribution process and a preparation method of the wear-resistant steel and belongs to the technical field of metal material processing. According to the wear-resistant steel used for the high-speed hammer and prepared through the dual quenching and distribution processes, through reasonable composition design of an alloy system and the creative dual quenching and distribution process, the texture of the steel is finer and more uniform, the lath width is obviously reduced, and the finally obtained proportion-controllable dual-phase texture has the comprehensive mechanical properties of high hardness, high strength, high roughness and high fatigue resistance. As for the material, the yield strength Rp0.2 is larger than or equal to 1550 MPa, the tension strength Rm is larger than or equal to 1950 MPa, the elongation-after-fracture A is larger than or equal to 13%, the product of strength and elongation is larger than or equal to 25 GPa.%, the V-shaped notch impact power is larger than or equal to 13 J and the hardness is larger than or equal to 55 HRC. Membranous residual austenite distributed between Martensite laths is beneficial for coordinating deformation under the condition of texture stress, also has a remarkable effect of hindering spreading of microscopic cracks, the fatigue resistance of the material is improved, and the service life of the hammer is prolonged. The wear-resistant steel and belongs to the technical field of metal material processing is an ideal material for steel for hammers of smashers.
Description
technical field [0001] The invention belongs to the technical field of metal material processing, and relates to a wear-resistant steel with a dual-phase structure of lath-like martensite and retained austenite at room temperature, and a double quenching and partitioning steel with high hardness, high wear resistance and good toughness A wear-resistant steel for high-speed hammer heads and a manufacturing method thereof. Background technique [0002] Hammer crushers are mainly divided into two types: hammerhead crushers and impact blow bar crushers. Due to its simple structure, high production efficiency and simple maintenance, the hammer crusher has been widely used in industries such as mining, metallurgy, building materials, roads, railways, water conservancy and electric power. Common materials used to produce hammer heads include high manganese steel, wear-resistant cast steel, and high-chromium wear-resistant cast iron. The hammer head or blow bar is the main wearabl...
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Application Information
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