低活化钢析出相热力学研究.pdfVIP

第！！卷 第7期 材 料 工 程 Vol .44 No. 7 2016年7月 第 37 — 42页 Journal of Materials Engineerin Jul . 2016 pp .37 — 42 低活化钢析出相热力学研究 T herm odynam ic A nalysis on P recip itated P hases in Low A ctivation Steel 庞启航，唐 荻 ，赵征志，武会宾，李 烁 (北京科技大学冶金工程研究院，北京100083) PANG Qi -hang，TA N G D i，ZH A O Zhen -zhi，W U H ui -b in ，L I Shuo (Engineerin Research In stitu te , University of Science and Technology Beijin , Beijin 100083 , China ) 摘要：设计了一种低碳低活化铁素体/马氏体钢，利用扫描电镜、透射电镜和拉伸实验等方法观察和测定了实验钢在不 同制备工艺下的显微组织和力学性能，并对其析出物进行EDS化学成分检测，同时通过热力学计算研究了低碳低活化 钢析出相的析出规律。结果表明：热乳后经\80C 保温1h 完全奥氏体化淬火与750C 保温1h 空冷处理后 ，能够制备出 性能达标的超低碳实验钢；析出相主要为M2C%和M X 相，其中M2 C%主要在950°C 以下乳制和热处理过程中析出，而 M X 主要在乳制过程中大量析出，同时在快速冷却和热处理过程中的二次析出比较少。 关键词：低活化钢；显微组织；热力学；析出行为 doi ： 10. 11868/ i . issn. 1001-4381. 2016. 07. 007 中图分类号：TG 142. 74 文献标识码 ：A 文章编号：1001-4381(2016)07-0037-06 Abstract ： A type of low-carbon reduced activation ferritic/m artensitic (R A F M ) steel is designed . The microstructure and mechanical properties of tested steels prepared by different technologies were in ­ vestigated by means of scannin electron microscope ， transmission electron microscope and tensile test . The chemical composition of precipitations of tested steels are inspected by energy dispersive spectroscopy (E D S )，meanwhile the law of precipitation phase of low carbon low activation FM steel was studied by thermodynamic calculations . The results show that the best mechanical properties are obtained by temperin at 750〇C for lh after quenched from heatin at 980〇C for lh . The lo