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首页> 外文期刊>Materials Science and Technology: MST: A publication of the Institute of Metals >Effect of Nb on dynamic strain induced austenite to ferrite transformation
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Effect of Nb on dynamic strain induced austenite to ferrite transformation

机译：铌对动态应变诱发奥氏体向铁素体相变的影响

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摘要

Dynamic strain induced transformation (DSIT) is an interesting processing route to obtain ultrafine ferrite grains. In the present work, the effect of Nb on DSIT was investigated. Samples of low C-Mn steels, with and without Nb, were intensively deformed in hot torsion, aiming at the production of ultrafine ferrite grains. After soaking at 1200 deg C, the samples were cooled to 1100 deg C, submitted to hot torsion deformation to decrease the grain size and then cooled to 900, 850 or 800 deg C for further hot torsion deformation. In the steel without Nb, recrystallisation took place before enough deformation could be accumulated to induce ferrite formation, so DSIT would only take place at the lowest temperature investigated, 800 deg C. In the Nb steel, Nb addition delayed austenite recrystallisation, allowing DSIT ferrite to form at higher temperature than in the steel without Nb, 850 deg C.
机译：动态应变诱导相变（DSIT）是获得超细铁素体晶粒的有趣方法。在目前的工作中，研究了Nb对DSIT的影响。具有和不具有Nb的低C-Mn钢样品在热扭力下会发生剧烈变形，目的是生产超细铁素体晶粒。在1200℃下均热后，将样品冷却至1100℃，进行热扭变形以减小晶粒尺寸，然后冷却至900、850或800℃以进行进一步的热扭变形。在没有Nb的钢中，先发生再结晶，然后才能积累足够的形变以引起铁素体形成，因此DSIT仅在所研究的最低温度800℃下发生。在Nb钢中，Nb的添加会延迟奥氏体再结晶，从而允许DSIT铁素体在850℃下比在没有Nb的钢中更高的温度下形成。

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