CN101864541A - Heat-resistance and wear-resistance steel for magnesium semi-solid slurry stirring device - Google Patents
Heat-resistance and wear-resistance steel for magnesium semi-solid slurry stirring device Download PDFInfo
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- CN101864541A CN101864541A CN200910066830A CN200910066830A CN101864541A CN 101864541 A CN101864541 A CN 101864541A CN 200910066830 A CN200910066830 A CN 200910066830A CN 200910066830 A CN200910066830 A CN 200910066830A CN 101864541 A CN101864541 A CN 101864541A
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Abstract
The invention relates to heat-resistance and wear-resistance steel, which comprises the following chemical components (in percentage by weight): 15 to 0.40 percent of C, 0.2 to 1.0 percent of Mn, 0.3 to 1.5percent of Si, 10.0 to18.0 percent of Cr, 3.0 to 8.0 percent of Mo, 5.0 to 10.0 percent of Co, 1.0 to 5.0 percent of W, less than or equal to 0.10 percent of P, less than or equal to 0.10 percent of S and the balance of Fe and inevitable microimpurities. The alloy steel material is used in manufacturing of mechanical stirring blades or stirring rods used for preparing magnesium alloy semi-solid slurry.
Description
Technical field
The present invention relates to a kind of heat-resistance abrasion-resistance alloy steel, this material is mainly used in mechanical stirring blade or the stirring rod of making the magnesium alloy semisolid slurry preparation.
Background technology
Semi-solid processing is the novel method of a kind of metal forming of wait proposing of professor M.C.Flemings of Massachusetts Institute Technology's seventies in 20th century.This technological synthesis solidify the processing and the strong point of plastic working, be that processing temperature is lower than liquid state, resistance to deformation is littler than solid-state, utilize metal to form, can shape complex-shaped and precision and the higher part of performance requriements by an aximal deformation value from the characteristic that liquid state is had to solid state transformation (being liquid-solid coexistence) process.There is patent semi-solid processing to be called " the most promising material forming working method of 21 century " abroad.
In developed country, aluminium alloy semi-solid processing technology (thixotropic forming) is ripe and enter industrial application, is mainly used in fields such as automobile, electrical equipment, aerospace.The semi-solid state forming technique of magnesium alloy development relatively is later, and proven technique has only thixotropic injection moulding technology (Thixomolding), also is present unique magnesium alloy semi solid state forming technique that is used for suitability for industrialized production.
China starts late for the research of semi-solid state forming technique.The later stage eighties 20th century begins, domestic priority has many colleges and universities and scientific research institution to carry out the research work of semi-solid state forming technique, as units such as University of Science ﹠ Technology, Beijing, Southeast China University, Harbin Institute of Technology, Shanghai Communications University, Beijing Non-Ferrous Metal Research General Academy, designed different experimental installations, in the fundamental research of semi-solid state forming technique, make encouraging progress.
In the at present domestic research work, the method for preparing semi solid slurry has multiple.Mechanical stirring prepares semi-solid metal slurry or blank is a present laboratory applications method the most widely, this method is to utilize the blade of mechanical rotation or growth and the evolution that stirring rod changes metal primary crystal when solidifying, acquisition has semi-solid state metal rheological slurry spherical or the nascent solid phase of near-spherical, and these nascent solid phases spherical or near-spherical evenly are suspended in the mother liquor.In whipping process, control the nascent fraction solid of semi-solid-state metal by the temperature of control teeter column, come controlling shear speed by the rotating speed that changes blade or stirring rod, and then the form of control solid phase particles, and can guarantee that the shearing rate in the whole whipping process keeps constant.
Mechanical stirring device is simple in structure, and cost is low, easy to operate, shearing rate is easy to control, is fit to very much breadboard research work.It is low that but the main drawback of mechanical mixing method is a production efficiency, and the life-span of teeter column and stirring rod is short, and simultaneously, stirring rod is easy to pollute semi-solid-state metal.Therefore, mechanical mixing method only is fit to breadboard research work at present, can't prepare high-quality semi-solid metal slurry or blank, more can't satisfy the needs of commercial production.
Summary of the invention
The object of the present invention is to provide a kind of chemical composition of heat-resistance abrasion-resistance alloy steel, this kind steel alloy can be used for making the mechanical stirring blade or the stirring rod of preparation magnesium alloy semisolid slurry.
For achieving the above object, contain elements such as carbon, manganese, silicon, chromium, molybdenum, cobalt, rare earth in the heat-resistance abrasion-resistance alloy steel of the present invention, surplus is an iron, the concrete composition and the weight percent of alloy are as follows:
C：0.15-0.40％ Mn：0.2-1.0％
Si：0.3-1.5％ Cr：10.0-18.0％
Mo：3.0-8.0％ Co：5.0-10.0％
W：1.0-5.0％ P：≤0.10％
S：≤0.10％
All the other are Fe and inevitable trace impurity.
The basis of design of heat-resistance abrasion-resistance alloy Steel Alloy element chemistry composition Design and content range is as follows among the present invention:
(1) carbon (C): the hardness and the toughness that mainly influence steel alloy.Carbon is the main carbide that forms in steel alloy, and the composition of carbide, distribution and quantity are the keys of its performance of decision.The carbon content height, then carbide quantity is many, and the hardness of material improves, but toughness reduces the fragility increase; Carbon content is low, and then formed carbide quantity is few, and hardness reduces, and wear resistance also reduces.So the present invention is controlled at 0.15-0.40% with carbon content.
(2) manganese (Mn): manganese has the effect of solution strengthening, can be dissolved in respectively in matrix and the carbide, both can strengthen matrix, can increase the dispersity and the stability of carbide again, and the wear resistance that improves steel alloy is had good action.Therefore, in steel alloy, can add suitable manganese, among the present invention content is controlled at 0.2-1.0%.
(3) silicon (Si): the antioxidant property of steel alloy is improved.On the one hand, at high temperature, can form one deck SiO2 film on the steel alloy surface, reduce the tendency to oxidize of steel alloy; On the other hand,, can form silicic acid layer or ferric metasilicate layer, significantly improve resistance to high temperature oxidation, the curability of steel alloy with the chromium element.But too high silicone content will reduce toughness, increase fragility.The present invention is controlled at 0.3-1.5% with silicone content.
(4) chromium (Cr): chromium is the principal element that influences steel alloy antioxidant property and wear resisting property, can form the higher Cr7C3 type carbide of microhardness with carbon.In addition, chromium also can form the Cr2O3 oxide film of one deck densification on the steel alloy surface, plays passivation, can strengthen the performance of the corrosion resistance and the resistance to high temperature oxidation of steel alloy.The present invention is controlled at 10.0-18.0% with chromium content.
(5) molybdenum (Mo): the main effect of molybdenum is to make homogeneous microstructure, refinement, improves the heat resistance and the wear resistance of steel alloy.When containing the molybdenum amount and be lower than 1%, the heat-resistant antifriction of steel alloy can not meet the demands; But contain the molybdenum amount when higher,, therefore, contain the molybdenum amount and be chosen in 3.0-8.0% the cost of steel alloy is improved.
(6) cobalt (Co): the main effect of cobalt is the thermostability that improves steel alloy.Among the present invention cobalt contents is set at 5.0-10.0%.
(7) tungsten (W): the effect of tungsten mainly is the thermostability that improves steel alloy, among the present invention W content is set at 1.0-5.0%.
(8) phosphorus (P) and sulphur (S): p and s is sneaked into furnace charge or in alloying process, is harmful element, should reduce its content as far as possible, and the present invention is controlled at its content≤and 0.10%.
Technical process of the present invention is: batching-melting-adjustment composition-and with alterant-come out of the stove-pour into a mould.
Specific embodiment:
Embodiments of the invention are:
A kind of mechanical stirring rod that is used to prepare the semi-solid magnesium alloy slurry, its chemical ingredients (weight percent) is:
C:0.27%, Mn:0.62%, Si:1.1%, Cr:16%, Mo:6.3%, Co:8.7%, P :≤0.10%, S :≤0.10%, W:2.10%, all the other are Fe and inevitable trace impurity.
The mechanical property of above-mentioned mechanical stirring rod is: HRC＞=62
a?k＞＝20J/cm2
High-temperature mechanical property: in the time of 600 ℃, σ b=719MPa, σ 0.2=582MPa, δ=22%, ψ=69%;
In the time of 700 ℃, σ b=481MPa, σ 0.2=356MPa, δ=28%, ψ=82%.
Claims (2)
1. heat-resistance abrasion-resistance alloy steel, its form and weight percent as follows:
C:0.15-0.40%, Mn:0.2-1.0%, Si:0.3-1.5%, Cr:10.0-18.0%, Mo:3.0-8.0%, Co:5.0-10.0%, W:1.0-5.0%, P :≤0.10%, S :≤0.10%, all the other are Fe and inevitable trace impurity.
2. according to claim 1 described heat-resistance abrasion-resistance alloy steel, it is characterized in that this heat-resistance and wear-resistance steel is used to make the mechanical stirring blade or the stirring rod of magnesium alloy semisolid slurry preparation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910066830A CN101864541A (en) | 2009-04-16 | 2009-04-16 | Heat-resistance and wear-resistance steel for magnesium semi-solid slurry stirring device |
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| CN200910066830A CN101864541A (en) | 2009-04-16 | 2009-04-16 | Heat-resistance and wear-resistance steel for magnesium semi-solid slurry stirring device |
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| CN200910066830A Pending CN101864541A (en) | 2009-04-16 | 2009-04-16 | Heat-resistance and wear-resistance steel for magnesium semi-solid slurry stirring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994069A (en) * | 2010-12-10 | 2011-03-30 | 长春工业大学 | Novel hot working alloy steel for magnesium alloy melt quantitative conveying system |
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2009
- 2009-04-16 CN CN200910066830A patent/CN101864541A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994069A (en) * | 2010-12-10 | 2011-03-30 | 长春工业大学 | Novel hot working alloy steel for magnesium alloy melt quantitative conveying system |
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Application publication date: 20101020 |