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Carburized and high-frequency hardened part having high strength

一种高频淬火、零件的技术，应用在机械零件领域，能够解决碳浓度差异大、高频淬火组合困难、残留碳化物量增加等问题

Active Publication Date: 2008-10-15
AISIN AW CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large difference in carbon concentration due to the position of the part, especially the edge shape part tends to form a high concentration, so the amount of residual carbides also increases. Due to such problems, the combination with induction hardening is more difficult

Method used

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  • Carburized and high-frequency hardened part having high strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] Steel for carburizing in which the alloy compositions shown in Table 1 are dissolved. Each material was machined into the following test gear shapes,

[0050] Module: 2.5 Number of gears: 30.

[0051] Pitch: 82.753mm

[0052] Gear width: 20mm

[0053] Twist angle: 25 degrees

[0054] Use acetylene gas or propane gas to maintain a temperature of 900-1050°C for vacuum carburizing. As a condition for vacuum carburizing, the degree of reduced pressure is 0.001-0.1 bar. After carburizing, use nitrogen or atmospheric gas as the refrigerant to cool slowly to below 500°C at a cooling rate of 0.1°C / s. For carburized gears, the presence or absence of carbides and the surface carbon concentration were measured.

[0055] The gear surface after slow cooling was subjected to induction hardening under the following conditions to harden the gear surface.

[0056] Heating: 760~900℃ within 10 seconds

[0057] Keep: 760~900℃ within 1 minute

[0058] Quenching: 200~2000℃ / sec water ...

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Abstract

The present invention relates to a mechanical part, which is obtained by: processing a steel into a shape of a part, the steel having an alloy composition containing, by weight percent, C: 0.10 to 0.30%, Si: 0.50 to 3.00%, Mn: 0.30 to 3.00%, P: 0.030% or less, S: 0.030% or less, Cu: 0.01 to 1.00%, Ni: 0.01 to 3.00%, Cr: 0.20 to 1.00%, Al: 0.20% or less, N: 0.05% or less, and the remainder of Fe and inevitable impurities, and the alloy composition satisfying the following condition: in which [Si %], [Ni %], [Cu %] and [Cr %] represent the concentration of Si, the concentration of Ni, the concentration of Cu and the concentration of Cr in the alloy composition, respectively; subjecting the steel to a carburizing treatment in a vacuum, followed by gradually cooling the steel; and subsequently subjecting the steel to a high-frequency hardening to thereby harden a surface of the steel.

Description

technical field [0001] The present invention relates to a method for surface hardening treatment of steel, and relates to machine parts using carburizing and induction hardening in combination. Background technique [0002] Carburizing and induction hardening are representative methods of surface hardening when steel is used as a material to manufacture machine parts that require high surface hardness, such as gears. Carburizing is an operation to increase the carbon concentration on the surface of the part, and as a result, high strength can be obtained. However, the interior of the part is also martinized by quenching after carburizing, so there is a problem of large residual deformation. On the other hand, high-frequency quenching is a treatment that does not change the internal structure of the part, but only hardens the surface, so it has the advantage of small deformation, but from the perspective of manufacturability, the attainable surface carbon concentration is lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/42C22C38/44C21D1/18C23C8/22
CPCC22C38/04C21D9/32C22C38/08C21D1/74C21D1/06C22C38/02Y02P10/20C22C38/06C22C38/20C22C38/34C22C38/38C22C38/42C22C38/58C23C8/22
Inventor 大林巧治桑原正树松川太郎江藤裕水野孝树森田敏之
Owner AISIN AW CO LTD
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