摘要
利用光学显微镜观察实验耐火钢在不同正火温度下的铁素体组织形态,分析了针状铁素体组织随正火温度的变化情况。利用透射电镜观察其回火前后微观组织的变化,探讨了其微观组织结构对性能的影响。研究结果表明,耐火钢的组织主要由针状铁素体、块状铁素体和贝氏体以及少量的马氏体组成。其中,针状铁素体中含有高密度位错,大量的位错相互缠结。随着正火温度的升高,针状铁素体逐渐减少,块状铁素体逐渐增多,力学性能也不断的降低。回火后其针状铁素体组织中仍含有大量缠结的位错,有利于提高耐火钢的高温性能,拥有良好的高温屈服强度。
The ferrite morphology of the experimental steel in different normalizing temperature is ob- served by means of OM, and the changes of acicular ferrite microstructure along with the normalizing temperature are analyzed. The changes of microstructure before and after the tempered are observed by means of TEM, and effects of microstructure on the properties are studied. The results show that： The FR steel Microstructure is composed by acicular ferrite, blocky ferrite, bainite and a small a- mount of martensite. The acicular ferrite contains the high density dislocation, and a large number of dislocations are entangled together. With the increase of normalizing temperature, the acicular ferrite decreases gradually, while the blocky ferrite increases and the mechanical properties have also been re- duced. After tempered, the acicular ferrite still contains a large number of the entangled dislocation. It makes a good effect on high temperature properties and high temperature yield strength of FR steel.
出处
《辽宁科技大学学报》
CAS
2012年第5期477-481,共5页
Journal of University of Science and Technology Liaoning
关键词
耐火钢
针状铁素体
高密度位错
FR steel
acicular ferrite
high density dislocation
作者简介
王亚男（1961-），女，辽宁鞍山人，教授。
