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Research Papers

Coupled Effects of Heating Method and Rate on the Measured Nonisothermal Austenization Temperature of Steel SUS420J1 in Heat Treatment

[+] Author and Article Information
Hongze Wang

Joining and Welding Research Institute (JWRI),
Osaka University,
11-1 Mihogaoka, Ibaraki,
Osaka 567-0047, Japan
e-mail: wanghz@jwri.osaka-u.ac.jp

Yosuke Kawahito

Joining and Welding Research Institute (JWRI),
Osaka University,
11-1 Mihogaoka, Ibaraki,
Osaka 567-0047, Japan
e-mail: kawahito@jwri.osaka-u.ac.jp

Yuya Nakashima, Kunio Shiokawa

Japan Fuji Electric Corporation,
Tokyo 191-8502, Japan

1Corresponding authors.

Manuscript received September 17, 2017; final manuscript received January 5, 2018; published online April 2, 2018. Assoc. Editor: Donggang Yao.

J. Manuf. Sci. Eng 140(6), 061014 (Apr 02, 2018) (10 pages) Paper No: MANU-17-1585; doi: 10.1115/1.4039115 History: Received September 17, 2017; Revised January 05, 2018

Steel SUS420J1, which is the key material of turbine blade, is generally treated by heat to improve the strength prior to use. And the austenization process at different heating rates would determine the depth and width of heat treatment. In this paper, the austenization temperatures in heat treatment with the heat from induction wire, infrared lamp, and laser are measured, respectively. The effect of heating rate on the austenization temperature has been investigated. The research results show that the measured austenization temperature increases with the heating rate. And this trend is specially enlarged in the heat treatment method with larger gradient of temperature distribution, e.g., laser. The calculated phase transformation threshold shows that negative linear relationship exists between the logarithmic heating rate and the logarithmic austenization threshold for both induction heating and infrared heating, while abnormal relationship exists for laser heating. Thermal finite element analysis (FEA) models are then developed to calculate the temperature distributions in these three heating methods, and the calculated results show that the nonuniform temperature distribution leads to the gap between the measured austenization temperature and that of the material, which also leads to the abnormal variation law of austenization threshold in laser heating. The measured austenization temperature in induction heating method is thought to be the closest to the actual austenization temperature of the material among these three methods. This paper provides a guide for choosing the proper parameters to heat the steel SUS420J1 in hardening.

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Figures

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Fig. 3

Experimental system for laser heating

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Fig. 2

Experimental system for heating by induction coil and infrared lamp

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Fig. 1

Equilibrium phase diagram of steel SUS420J1

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Fig. 4

Dilatometric curves of SUS420J1 steel at the different heating rates: (a) induction heating and (b) infrared heating

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Fig. 5

Temperature history curve obtained from laser heating

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Fig. 6

Effects of heating method and rate on the austenization temperature: (a) start temperature and (b) termination temperature

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Fig. 7

Effect of heating rate on the austenization duration

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Fig. 8

Effects of heating rate on the: (a) austenization start threshold and (b) austenization termination threshold

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Fig. 9

Heat flux distribution at different parameters

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Fig. 10

FEA model for induction and infrared heating: (a) geometry model and boundary condition and (b) mesh

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Fig. 11

FEA model for laser heating

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Fig. 12

Comparison of temperature distribution: (a) contour, (b) induction heating, (c) infrared heating, and (d) equivalent temperature

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Fig. 13

Temperature distribution in laser hardening: (a) contour, (b) along the line, and (c) equivalent temperature

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