Measurement of Flow Stress in Supercooled Austenite for High Hardenability Steel |
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Authors: | Yasuhiro Yogo Michiaki Kamiyama Takamichi Iwata Noritoshi Iwata Takashi Ishikawa |
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Affiliation: | (1) Toyota Central R&D Labs. Inc, Nagoya City, Japan;(2) Department of Materials Science and Engineering, Nagoya University, Nagoya, Japan |
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Abstract: | In this article, the isothermal flow stress in supercooled austenite was measured for a high hardenability steel. Supercooled
austenite forms at the nonequilibrium phase and changes into other phases within a short time. It was confirmed that conventional
tensile tests, which require maintaining a constant temperature before stretching, cannot accurately measure the flow stress
in supercooled austenite. Therefore, a new tensile test named “the continuous cooling tensile test” was developed. In this
test, stretching is conducted during continuous cooling. In the continuous cooling tensile test, the flow stress between 673 K
and 973 K (400 °C and 700 °C) was measured. Microscopic observations of the continuous cooling test results verified that
the microstructures were supercooled austenite. |
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Keywords: | |
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