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Abstract: The
low temperature superplastic characteristics, of commercial 40Cr steel
that is 3 cycles water-quenched and subsequent high-temperature
tempered, are investigated. The results show that the 40Cr steel has a
fine grain of 5~10 mm, and exhibited a elongation of 254%, a flow stress
of 108.1 MPa and a strain rate sensitivity m-value of 0.221 at the
temperature of 650 ℃
and at the initial strain rate of 3.16´10–4 s–1. The primary
superplastic deformation mechanism is thought to be
atom-diffusion-controlled grain boundary sliding.
Key words: Superplasticity
40Cr steel
Low temperature Microstructure
CLC No: TG113
江苏省高校自然科学基金资助项目(02KJD460004).
Received 20030604, received in revised form 20040310
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