A composite treatment surface modification method of water jet shot peening and plasma nitriding
A plasma infiltration and composite treatment technology, applied in the field of composite treatment surface modification of plasma nitriding, can solve the problems of insufficient nitriding depth, uneven nitriding layer, missing nitriding layer, etc., and achieve uniform deformation thickness and nitriding layer structure. The effect of uniform and improving the quality of the nitriding layer
Active Publication Date: 2018-09-25
GUIZHOU UNIV
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[0004] In order to solve the problems of inhomogeneity, lack of nitriding layer, and insufficient nitriding depth in the partial nitriding layer of the above-mentioned plasma nitriding, the present invention provides a composite surface modification method of water jet shot peening and plasma nitriding to overcome the existing problems. There are technical deficiencies
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[0019] 1) Process the original medium-carbon chromium and molybdenum steel into a sample with a size of 10mm×10mm×10mm;
[0020] 2) Prepare the sample, first heat up to 840°C for 15 minutes, oil cool to room temperature, then heat up to 580°C for 1 hour, then air cool to room temperature;
[0021] 3) The samples were polished with 0#~7# metallographic sandpaper, and then mechanically polished to the mirror surface;
[0022] 4) Soak the sample in absolute ethanol for ultrasonic cleaning for 15 minutes, dry it and set aside;
[0023] 5) Fix the sample on the stage and perform high-pressure water jet shot peening pretreatment. The water pressure is 100MPa, the nozzle diameter is 0.33mm, the distance between the nozzle and the sample surface is 10mm, vertical spraying, the nozzle moving speed is 500mm / min, water spray twice;
[0024] 6) Perform plasma nitriding treatment on the original sample and the water shot peening pretreated sample at the same time. Place the two samples ...
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The invention discloses a water jet shot blasting and plasma nitriding combined treatment surface modification method. The method is a combined treatment technology which firstly carries out surface accurate high-pressure water jet shot blasting reinforcement on parts to be subjected to plasma nitriding surface reinforcement before plasma nitriding and then carries out plasma nitriding. Through the adoption of the high-pressure water jet shot blasting and plasma nitriding combined treatment method, the quality of a nitrided layer of a sample is remarkably improved, the thickness of the nitrided layer of the sample is remarkably increased, and the problems that a part of the nitrided layer is nonuniform, even, the nitrided layer is missing, and the nitriding depth is insufficient due to the fact that only the plasma nitriding technology is adopted are solved, so that the quality of the nitrided layer is improved, the thickness of the nitrided layer is increased by over 100 <mu>m, the surface hardness of the sample is greatly improved, and the nitrided layer of which the hardness gradient distribution is reasonable and structure is uniform is obtained.
Description
technical field [0001] The invention relates to a composite treatment surface modification method of water jet shot peening and plasma nitriding, which belongs to the technical field of metal surface modification. Background technique [0002] Plasma nitriding technology is a common surface modification method of gear steel, which can significantly improve the surface hardness, wear resistance and fatigue performance of the material. As a widely used surface heat treatment technology, it has been widely used in industrial production. Plasma nitriding technology mainly produces active nitrogen atoms through cathode sputtering, enriches on the surface of the sample, and continuously diffuses into the matrix, finally forming a nitriding layer composed of a surface white layer and a subsurface diffusion layer. However, the part of the plasma nitriding layer has unevenness, even the nitriding layer is missing, and the nitriding depth is not enough. [0003] High-pressure water j...
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IPC IPC(8): C21D7/06C21D1/25C23C8/38C23C8/26C23F17/00
CPCC21D1/25C21D7/06C23C8/26C23C8/38C23F17/00
Inventor 梁益龙范航京梁宇李伟
Owner GUIZHOU UNIV