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Carburized parts

A component and carburizing technology, applied in the direction of coating, furnace type, furnace, etc., can solve problems such as performance degradation, and achieve the effect of solving abnormal grain growth and inhibiting abnormal grain growth

Active Publication Date: 2017-10-27
DAIDO STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0035] The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a carburized part that can effectively suppress abnormal grain growth even in Problems with degraded performance due to growth

Method used

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  • Carburized parts
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Examples

Experimental program
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Embodiment

[0183] Embodiments of the present invention will be described in detail below.

[0184] Each steel material having the chemical composition shown in Table 1 was melted, maintained under heating at 1,250°C for 4 hours, and then hot-rolled at a temperature of 950°C or higher, thereby forming the steel material into a diameter 30mm steel bar.

[0185] Prepared from each steel bar as figure 2 The dimensions shown in (A) are Coin-shaped sample 5 of 20 mm x 6 mm.

[0186] Then, sample 5 was subjected to gas carburization and quenching under the following conditions. Specifically, using propane as the carburizing gas, sample 5 was kept at 0.8% CP (carbon potential) at 1,100°C for 3 hours, and then the sample was kept at 850°C at 0.8% for 0.5 hours , and then quenched in oil at 80°C.

[0187] Subsequently, the sample was kept at 550° C. for 16 hours so as to make prior-austenite grain boundaries prone to appear, and then it was air-cooled.

[0188]

[0189] "T-N" indicates...

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Abstract

The present invention provides a carburized part, wherein after carburizing, the amount of all precipitate particles TiC, AlN and ZrC is 4.5×10-10 mol or less per 1 mm2 of the grain boundary area of ​​prior austenite grains. According to the present invention, it is possible to provide a carburized part which can effectively suppress abnormal grain growth even during carburizing treatment and which can solve the problem of performance degradation caused by abnormal grain growth.

Description

technical field [0001] The present invention relates to carburized components, and more particularly to carburized components having an ordered grain structure in which the grains are uniform in size. Background technique [0002] For example, for mechanical parts such as gears, bearing parts, and shafts used in automobiles, JIS steel grades such as SCr420 are usually machined into the shape of the part and then surface-hardened by carburizing hardening to improve wear resistance , fatigue strength, etc. to be used. [0003] Carburizing hardening is a high-temperature heat treatment for a long time, which tends to cause coarsening of crystal grains. [0004] For this reason, various studies have been conducted and various proposals have been made in order to prevent crystal grains from becoming coarser. [0005] As a useful technique for preventing crystal grains from becoming coarse, a technique is widely known in which grain boundaries are pinned by precipitating particl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D9/28C21D9/32C21D9/40C22C38/60C23C8/22C21D1/06
CPCC21D1/06C21D9/0068C21D9/28C21D9/32C21D9/40C21D2211/004C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/54C22C38/60C23C8/22
Inventor 中山恭平酒井康明森田敏之井上圭介
Owner DAIDO STEEL CO LTD
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