Nanometer crystal twinning ultrahigh-hardness surface forming method of nickel base alloy
A technology of nickel-based alloys and nano-twins, which is applied in the field of plastic forming of nickel-based alloys, and can solve the problems of low surface hardness and wear resistance of nickel-based alloys
Inactive Publication Date: 2015-09-09
DALIAN UNIV OF TECH
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Problems solved by technology
[0005] The purpose of the present invention is to provide a method for forming a nano-twinned ultra-high hardness surface of a nickel-based alloy to solve the problem that the surface hardness of the nickel-based alloy is low and not resistant to wear
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0016] The specific implementation manner of the present invention will be described in detail below in conjunction with the technical solutions.
[0017] A ternary nickel-chromium-molybdenum alloy is selected, and the main component is (wt.%) Ni56-Cr23-Mo16. The hardness of the alloy is 2.6-3.0GPa. The size of the alloy is 10×10×1mm 3 , after grinding and chemical mechanical polishing, ultrasonic cleaning with acetone and petroleum ether, and natural evaporation, the surface roughness Ra of the nickel-based alloy measured on the Zygo non-contact profiler Newview5022 in the United States is 1.2nm. The nickel-based alloy sheet is bonded to the round steel sheet of the nanoindenter TI950 with 502 glue, placed on the sample stage of the nanoindenter, and fixed on the sample stage by magnetic adsorption.
[0018]The raw material of the diamond tip is natural diamond with a size of 1 mm. According to the texture of natural diamond, select the hardest (111) surface as the embossi...
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Abstract
The invention discloses a nanometer crystal twinning ultrahigh-hardness surface forming method of a nickel base alloy, and belongs to the technical field of plastic forming of nickel base alloys. The method is characterized in that a sample is the nickel alloy base; a submicron curvature radius diamond needle point is manufactured by methods of ultraprecise grinding and low-carbon steel polishing; a curvature radius of the needle point is 200-900 nm; an projection angle is 90-150 degrees; the needle point takes the shape of a triangular pyramid or a rectangular pyramid; the diamond needle point is mounted on a nanometer indentation instrument or a microhardness tester for impressing; the load is 0.2-2 N; the surface hardness can be increased by 20-40 times compared with a traditional alloy, and reaches 100-120 GP; the surface consists of nanometer twin crystals; and the nanometer twin crystals consist of arrays formed by a twin crystal plate with a thickness not smaller than 15 nm and one or several twin crystal plates with the thickness smaller than 15 nm, can bear 100 times of circular loading, and have no cracks on the surfaces after being loaded. The nanometer crystal twinning ultrahigh-hardness surface forming method of the nickel base alloy is realized.
Description
technical field [0001] The invention belongs to the technical field of plastic forming of nickel-based alloys, relates to a precision plastic forming method of nickel-based alloys, in particular to a method for forming a nickel-based alloy nano-twinned ultra-high hardness surface. Background technique [0002] Nickel-based alloys are indispensable key component materials in aviation, aerospace, nuclear power, marine and other fields. They are a reflection of a country's industrial advancement and one of the important indicators of a country's industrial advancement. The ultra-high hardness surface of nickel-based alloys is a major demand of the country, such as the main shaft of nuclear main pumps, bearings, aero-engine main shafts, bearings, the surfaces of key parts of nickel-based alloys under stress, and the moving secondary surfaces of nickel-based alloys, all of which need to be wear-resistant Fatigue-resistant high-performance surfaces, which require nickel-based allo...
Claims
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IPC IPC(8): C22F1/10
Inventor 张振宇王博段能东郭东明
Owner DALIAN UNIV OF TECH