INVESTIGATION ON LOW TEMPERATURE SUPERPLASTICITY OF 40Cr STEEL

Abstract

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: 40Cr steel, Low temperature, Microstructure, Superplasticity

CLC Number:

TG113

Xu Xiaojing;Shi Lianjie;Cheng Xiaonong;Cai Lan;Ji Pingping. INVESTIGATION ON LOW TEMPERATURE SUPERPLASTICITY OF 40Cr STEEL[J]. , 2004, 40(7): 141-144.

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INVESTIGATION ON LOW TEMPERATURE SUPERPLASTICITY OF 40Cr STEEL

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