Hot ductility of medium carbon steel with vanadium
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- 作者：Chang-Hoon Lee<sup>asup><sup> ; sup><sup>lee1626@kims.re.kr" class="auth_mail" title="E-mail the corresponding authorsup> ; Jun-Young Park<sup>asup> ; JunHo Chung<sup>bsup> ; Dae-Bum Park<sup>bsup> ; Jin-Young Jang<sup>bsup> ; Sungyul Huh<sup>bsup> ; Sung Ju Kim<sup>bsup> ; Jun-Yun Kang<sup>asup> ; Joonoh Moon<sup>asup> ; Tae-Ho Lee<sup>asup>
- 关键词：Hot ductility ; Medium carbon steel ; Vanadium
- 刊名：Materials Science & Engineering A
- 出版年：2016
- 出版时间：10 January 2016
- 年：2016
- 卷：651
- 期：Complete
- 页码：192-197
- 全文大小：3021 K
文摘
Hot ductility of medium carbon steel containing 0.52 wt% of carbon and 0.11 wt% of vanadium was investigated using a hot tensile test performed up to fracture. The hot ductility was evaluated by measuring the reduction of area of the fractured specimens, which were strained at a variety of test temperatures in a range of 600–1100 °C at a strain rate of 2×10<sup>−3sup>/s. The hot ductility was excellent in a temperature range of 950–1100 °C, followed by a decrease of the hot ductility below 950 °C. The hot ductility continued to drop as the temperature was lowered to 600 °C. The loss of hot ductility in a temperature range of 800–950 °C, which is above the Ae<sub>3sub> temperature, was due to V(C,N) precipitation at austenite grain boundaries. The further decline of hot ductility between 700 °C and 750 °C resulted from the transformation of ferrite films decorating austenite grain boundaries. The hot ductility continued to decrease at 650 °C or less, owing to ferrite films and the pearlite matrix, which is harder than ferrite. The pearlite was transformed from austenite due to relatively high carbon content.