Heat treatment technology of 18Cr2Ni4WA workpieces

A workpiece and process technology, which is applied in the heat treatment process field of 18Cr2Ni4WA workpiece, can solve the problem that the heat treatment process of 18Cr2Ni4WA workpiece cannot meet the harsh service environment requirements of the cam, and achieve the effect of solving pitting failure, small deformation and reducing processing cost

Active Publication Date: 2021-04-23
SHANXI PINGYANG IND MACHINERY
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Problems solved by technology

[0003] The invention aims to solve the technical problem that the heat treatment process of the existing 18Cr2Ni4WA workpiece cannot meet the requirements of harsh service environments such as cams

Method used

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  • Heat treatment technology of 18Cr2Ni4WA workpieces
  • Heat treatment technology of 18Cr2Ni4WA workpieces

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Embodiment Construction

[0022] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0023] The following is an example of a product part cam, its material is 18Cr2Ni4WA, the surface of the workpiece is a special-shaped surface, and the external dimension is Φ80×60, refer to figure 2 , the specific heat treatment steps are as follows:

[0024] 1) Quenching and tempering treatment: the purpose of this step is to improve the structure and obtain good chip performance. In addition, it can also refine the crystal grains and reduce the deformation of subsequent heat treatment. Due to the high content of alloy elements in 18Cr2Ni4WA steel, the composite effec...

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Abstract

The invention relates to the related technical field of heat treatment of 18Cr2Ni4WA workpieces, in particular to a heat treatment technology of the 18Cr2Ni4WA workpieces, and aims to solve the technical problem that an existing heat treatment technology of the 18Cr2Ni4WA workpieces cannot meet the requirements of severe service environments such as cams and the like. The technology sequentially comprises the following steps that (1) hardening and tempering treatment is performed; (2) carburizing in a controlled atmosphere is performed, specifically, the workpieces are placed in a controllable atmosphere furnace to be carburized, the carbon potential in the furnace is set to range from 1.0% to 1.2% during carburizing, the carburizing temperature is set to range from 920 DEG C to 950 DEG C, and the carburizing time is set according to the layer depth requirement of a carburized layer; (3) direct quenching is performed, specifically, the workpieces are cooled along with the furnace or cooled to 830-860 DEG C through introduction of nitrogen into the furnace, and after heat preservation is performed for 25-35 min, oil cooling is performed or nitrogen is introduced for cooling to the room temperature; and (4) low-temperature tempering is performed, specifically, tempering is performed for 1-2 h at the temperature of 100-200 DEG C.

Description

technical field [0001] The invention relates to the technical field related to heat treatment of 18Cr2Ni4WA workpieces, in particular to a heat treatment process for 18Cr2Ni4WA workpieces. Background technique [0002] 18Cr2Ni4WA is a high-strength alloy carburizing steel with high strength and toughness and good hardenability. The conventional heat treatment process for workpieces made of it is: quenching and tempering + carburizing at 920°C + high temperature tempering (generally three times) +780- 800℃ quenching + low temperature tempering (see figure 1 Conventional carburizing and quenching process). After the above heat treatment method, the surface of the workpiece will get fine acicular martensite + a small amount of retained austenite (≥15%) + more granular carbides, the hardness of the surface can reach HRC58-62, and the hardness of the core can reach HRC38- 45. One of the uses of 18Cr2Ni4WA is to make the engine cam structure. The wear form of the working surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C21D1/18C21D1/74C21D9/32
CPCC23C8/22C21D1/18C21D1/74C21D9/32
Inventor 李炳坤倪伟张庆辉王金强
Owner SHANXI PINGYANG IND MACHINERY
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