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Air-hardenable bainitic steel part

A technology for bainitic, steel parts, applied in the field of air-hardened bainitic steel parts, which can solve the problems of large capital expenditure maintenance costs, increased component manufacturing costs, etc.

Inactive Publication Date: 2016-11-09
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat treatment process adds significantly to the manufacturing cost of the part and also requires significant capital expenditure as well as ongoing maintenance costs

Method used

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  • Air-hardenable bainitic steel part
  • Air-hardenable bainitic steel part
  • Air-hardenable bainitic steel part

Examples

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Embodiment Construction

[0012] Disclosed herein is a steel part including selectively air hardened regions and a method for making the steel part having enhanced strength, wear resistance and toughness properties. In an embodiment, the steel piece includes a first region having a first set of properties and a second region having a second set of properties. By cooling the first zone at a first cooling rate and the second zone at a second cooling rate, steel parts can be manufactured economically without the heat treatment steps previously thought to be necessary to achieve the desired strength of the first and second zones , wear resistance and toughness properties are necessary. Producing the first set of properties and the second set of properties without the need for a heat treatment process after forging the piece can result in significant cost savings. Capital investment for heat treatment capacity and maintenance costs for furnaces and other equipment can be reduced.

[0013] figure 1 is a p...

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PUM

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Abstract

A method of producing a forged steel part (200) is disclosed. The method includes providing a steel billet that can be selectively hardened to different hardness levels by varying the air cooling rate. The method also includes heating the steel billet to an austenization temperature of the steel billet. The method further includes hot forging the steel billet to form the steel part (200) including a first region (210) and a second region (220). The method yet further includes selectively cooling the hot forged steel part (200) by air cooling the first region (210) at a first cooling rate and air cooling the second region (220) at a second cooling rate that is less than the first cooling rate.

Description

technical field [0001] The present invention relates generally to an air-hardened bainitic steel part, and more particularly to an air-hardened bainitic steel part that is selectively hardened to different hardness levels by varying the air cooling rate. Background technique [0002] Structural components used in machinery, such as track chains used on the chassis of track-type earth-moving machines, require material properties including good yield strength, good wear resistance, good toughness, and good resistance to rolling contact fatigue . Track chains for use on the tracks of tracked machines, such as bulldozers or other earth moving equipment, are well known in the art. [0003] Manufacturing methods used to obtain the desired material properties of a track chain or other structural component typically include hot forging the component from a billet, followed by cooling, reheating to austenitizing temperature, quenching, and tempering. Following these heat treatment ...

Claims

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Application Information

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IPC IPC(8): C21D9/00C22C38/02C22C38/04C22C38/12C22C38/14C22C38/18C22C38/32
CPCC21D9/0087C22C38/001C22C38/02C22C38/04C22C38/12C22C38/14C22C38/18C22C38/32C21D2211/002C21D2211/005C21D2261/00C21D2221/00C21D2211/008C21D7/13C22C38/22C22C38/24C22C38/28C22C38/34C22C38/38Y02P10/25B62D55/20C21D8/005C21D9/0068C21D2211/001
Inventor T·刘M·T·凯瑟
Owner CATERPILLAR INC