材料科学
奥氏体
微观结构
电子背散射衍射
马氏体
退火(玻璃)
冶金
铁氧体(磁铁)
透射电子显微镜
扫描电子显微镜
TRIP钢
均质化(气候)
复合材料
生物多样性
生态学
生物
纳米技术
作者
Aleksandra Kozłowska,Mateusz Morawiec,Roumen H. Petrov,A. Grajcar
标识
DOI:10.1016/j.matchar.2023.112816
摘要
A novel double-step intercritical annealing (DSIA) process was conducted on Fe-0.16C-4.7Mn-1.6Al-0.2Si transformation induced plasticity (TRIP) steel. In a present study, an effect of different heating and cooling rates applied to the second intercritical annealing (IA) step on the microstructure was studied in detail by using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) techniques. The quantitative analysis of the retained austenite fractions for particular heat treatment variants was carried out via X-ray diffraction (XRD). The formation of complex microstructures containing a small fraction of ferrite, retained austenite and two types of martensite was observed regardless on the applied heating and cooling rates. It was found that the soft ferrite can be replaced by martensite through the incomplete stabilization of austenite with C and Mn during short second intercritical annealing step. The heating rate influences significantly the kinetics of austenite formation during the second heat treatment step. Low heating rates ensure more time for formation and homogenization of austenite during heating improving its thermal stability. Thus, the best balance of martensite and austenite fractions in combination with homogenous morphology of the microstructure was noted for the specimen heated at a rate of 3 °C/s, which was the lowest one in the reported experiment.
科研通智能强力驱动
Strongly Powered by AbleSci AI