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TECHNICAL PAPERS

Hot Deformation Behavior of Bearing Steels

[+] Author and Article Information
Ho Keun Moon, Jae Seong Lee

R&D Center, Shaeffler Korea Corp., Changwon, Korea, 641-020

Sun Joon Yoo

 POSCO Technical R&D Center, Pohang, Korea, 790-704

Man Soo Joun1

School of Mechanical and Aerospace Engineering, GyeongSang National University, Jinju, Korea, 660-701msjoun@nongae.gsnu.ac.kr

June Key Lee

School of Mechanical and Aerospace Engineering, GyeongSang National University, Jinju, Korea, 660-701; Department of Mechanical Engineering, The Ohio State University, Columbus, OH 43210

1

Corresponding author.

J. Eng. Mater. Technol 129(3), 349-355 (Apr 09, 2007) (7 pages) doi:10.1115/1.2744392 History: Received September 24, 2003; Revised April 09, 2007

The material behaviors of two types of bearing steels at hot working conditions are investigated. Stress-strain curves at various temperatures (900–1300°C) and strain rates (1–50/s) are obtained by compression tests with a computer controlled servo-hydraulic Gleeble 3800 testing machine. Elongation and reduction of the area are also obtained by tensile tests with the Gleeble 1500 testing machine. Flow stresses are calculated from the experiments and are used to predict the temperature distribution and the metal flow of a workpiece during a multistage hot forging process of a bearing race. A rigid-thermoviscoplastic finite element method is applied. The experimental and numerical results are summarized to reveal the reasons for internal crack formation.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic description of a hot forging process and its analysis model

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Figure 2

Hot compression tests of STB2 (75% upset at a constant rate of 10/s)

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Figure 3

True stress-strain curves at strain rate 10/s (STB2)

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Figure 4

True stress-strain curves at strain rate 10/s (SCr420H)

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Figure 5

True stress-strain curves at 1150°C (STB2)

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Figure 6

True stress-strain curves at 1250°C (SCr420H)

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Figure 7

Flow stress-strain rate curve at 1150°C (ϵ¯=0.3, STB2)

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Figure 8

Flow stress-strain rate curve at 1250°C (ϵ¯=0.3, SCr420H)

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Figure 9

STB2 specimens after pulled to fracture

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Figure 10

SCr420H specimens after pulled to fracture

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Figure 11

Variation of reductions of area with temperature and strain rate (STB2)

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Figure 12

Variation of reductions of area with temperature and strain rate (SCr420H)

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Figure 13

Forming velocity profile

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Figure 14

A set of mesh systems during simulation

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Figure 15

Temperature distribution of the material (STB2)

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Figure 16

Effective strain rate distribution of the material (STB2)

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Figure 17

Metal flow lines

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Figure 18

Internal crack of the material (STB2)

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Figure 19

SEM micrograph of intergranular fracture of the STB2 material deformed at 1250°C. Grains are covered with high-temperature oxide film.

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