Escobar Javier, Jiménez José Luis, Artigas Alfredo, Perez-Ipiña Juan, Monsalve Alberto
Department of Metallurgical Engineering, Universidad de Santiago de Chile, Av. Ecuador 3735, Estación Central, Santiago 9170124, Chile.
Conicet, Neuquén 8300, Argentina.
Materials (Basel). 2022 May 24;15(11):3748. doi: 10.3390/ma15113748.
The carbide precipitation kinetics in a Fe-22Mn-0.45C TWIP steel subjected to three different cold-deformation levels, annealed at various temperatures, were studied. The studied carbides included chemical compositions, morphology, precipitation sites, volume fraction, and size. Manganese carbides were precipitated in a temperature range between 525 and 650 °C. Volume fraction increased with cold-deformation and decreased with annealing temperature. Carbide size increased with cold-deformation and annealing temperatures up to 625 °C, suffering a notable reduction at 650 °C. Precipitation kinetics were described by means of precipitation curves for 0.1% (vol.) of Fe-Mn-carbides. A kinetic model was used, and two stages were found. Complementarily, austenite grain size and microhardness were also measured. With increases in annealing time, microhardness decreased until it reached a nearly constant value, indicating that recrystallization was complete, while, with increases in annealing temperature, grain size increased.
研究了在不同温度下退火的、经历三种不同冷变形程度的Fe-22Mn-0.45C孪晶诱发塑性钢中的碳化物析出动力学。所研究的碳化物包括化学成分、形态、析出位置、体积分数和尺寸。锰碳化物在525至650℃的温度范围内析出。体积分数随冷变形增加而增加，随退火温度降低而降低。碳化物尺寸随冷变形和退火温度升高至625℃而增大，在650℃时显著减小。通过Fe-Mn碳化物0.1%（体积）的析出曲线描述析出动力学。使用了动力学模型，发现了两个阶段。作为补充，还测量了奥氏体晶粒尺寸和显微硬度。随着退火时间的增加，显微硬度降低，直到达到几乎恒定的值，表明再结晶完成；而随着退火温度的升高，晶粒尺寸增大。
