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Cavitation and abrasion resisting iron-base alloy for hydropower mechinery in high water head and high flow speed condition

An iron-based alloy and hydraulic machinery technology, applied in the field of new cavitation-resistant and abrasive iron-based alloy materials, can solve the problems of energy and material loss, low service life of turbine blades, less than the design life, etc.

Inactive Publication Date: 2004-03-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic water turbine blade materials are mainly 0Cr13Ni5Mo. Although its cavitation resistance and abrasion resistance are better than those used earlier, the service life of water turbine blades is still low, sometimes even less than half of the design life, which is far from meeting the requirements, which is very surprising. energy and material loss

Method used

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  • Cavitation and abrasion resisting iron-base alloy for hydropower mechinery in high water head and high flow speed condition
  • Cavitation and abrasion resisting iron-base alloy for hydropower mechinery in high water head and high flow speed condition

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Experimental program
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Effect test

Embodiment

[0012] Embodiment: press technical scheme of the present invention, select two kinds of rubber-like characteristic iron-base alloys that main chemical composition is made by table 1, its prescription is respectively:

[0013] Formula 1): chemical composition (mass fraction, %)

[0014] C<0.1; Cr 9.5; Mn 20.5; Si 6; Cu 1.2 Fe the rest

[0015] Formula 2): chemical composition (mass fraction, %)

[0016] C<0.1; Cr 10.5; Mn 19.5; Si 5.5; Cu 1.2 Fe the rest

[0017] Formula 3): chemical composition (mass fraction, %)

[0018] C<0.1; Cr 10; Mn 20; Si 5.8; Cu 1.1 Fe the rest

[0019] Formula 4): chemical composition (mass fraction, %)

[0020] C<0.1; Cr 9.8; Mn 20.4; Si 6.2; Cu 1.2 Fe the rest

[0021] The results show that the above-mentioned formulations within the scope of the present invention can prepare iron-based alloys with rubber-like properties. And on the high-speed rotary disc test machine and the material 0Cr13Ni5Mo of the water turbine blades under the flow veloc...

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Abstract

Through smelting process, proper amount of alloy elements are added into iron-base alloy to make the alloy have rubber-like characteristics, including high impact resistance, high flushing corrosion resistance and excellent cavitation and abrasion resistance. Test shows that the alloy of the present invention has cavitation resistance and abrasive resistance 4-8 times and 3 times higher than that of 0Crl3Ni5Mo alloy separately at the condition of over 40 m / s water flow speed. The alloy is ideal cavitation and abrasion resisting material for water flowing parts in hydraulic power station, screw propeller in ship, high pressure valve and other parts in high water head and high flow speed work condition.

Description

[0001] 1. Field [0002] The invention relates to a new cavitation-resistant and abrasion-resistant iron-based alloy material for hydraulic machinery with high water head and high flow rate, which can be obtained by smelting methods, and is especially suitable for flow-through components of hydropower turbines in hydraulic machinery operating under high water head and high flow rate. (such as blades), ship propellers and high-pressure valves, etc. 2. Background technology [0003] Cavitation erosion of hydraulic mechanical flow components such as turbine blades, ship propellers, and high-pressure valves is the damage caused by the formation and collapse of air bubbles caused by changes in water flow pressure, and is affected by factors such as sediment content in water, flow conditions (such as flow velocity) and material properties. influences. If the water contains sand, the cavitation damage on the surface of the flow-passing parts will be aggravated by superimposed sand e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38
Inventor 朱金华王再友
Owner XI AN JIAOTONG UNIV