论文部分内容阅读
借助Thermo-calc软件对FeCrAl不锈钢所属的Fe-(18~21)Cr-(3~5)Al-(0~0.03)C-(0~0.2)Si-(0~0.2)Mn多元体系在凝固过程中的相变及析出行为进行了研究.采用Thermo-calc中TCFE7数据库对该体系的垂直截面图进行计算,分析了不同组元对凝固和冷却过程中相变的影响,并得到FeCrAl不锈钢的平衡凝固相变路径图.结果表明FeCrAl不锈钢由1600℃平衡冷却至300℃的过程中完整的平衡相变路径为:L→AlN+αδFe→AlN+αδFe+Cr_7C_3→AlN+αδFe+Cr_7C_3+Cr_(23)C_6→AlN+αδFe+Cr_(23)C_6→AlN+αδFe+Cr_(23)C_6+σ→AlN+αδFe+Cr_(23)C_6+σ+α’→AlN+αδFe+Cr_(23)C_6+α’.凝固过程中Cr_7C_3与σ相是否析出分别取决于体系中C、Si含量;Al含量的提高可扩大αδFe+Cr_7C_3的稳定区,降低α’相的析出温度,抑制σ相的析出;Cr含量的提高可以减小αδFe+Cr_7C_3的稳定区,扩大σ相和α’相的稳定区.
The Fe-Cr-based (3-5) Al- (0-0.03) C- (0-0.2) Si- (0-0.2) Mn multicomponent FeCrAl stainless steel was characterized by means of Thermo- The phase transition and precipitation behavior were studied.The vertical section of the system was calculated by TCFE7 database of Thermo-calc, the influence of different components on the phase transition during solidification and cooling was analyzed, and the FeCrAl stainless steel The results show that the complete equilibrium phase transformation path of FeCrAl stainless steel from 1600 ℃ to 300 ℃ is L → AlN + αδFe → AlN + αδFe + Cr_7C_3 → AlN + αδFe + Cr_7C_3 + Cr_ 23) C_6 → AlN + αδFe + Cr_ (23) C_6 → AlN + αδFe + Cr_ (23) C_6 + σ → AlN + αδFe + Cr_ (23) C_6 + σ + α ’→ AlN + αδFe + Cr_ (23) C_6 + α ’. Whether Cr_7C_3 and σ phases are precipitated depends on the content of C and Si, respectively. The increase of Al content can enlarge the stability zone of αδFe + Cr_7C_3, decrease the precipitation temperature of α’phase and inhibit the precipitation of σ phase. The increase of Cr content can reduce the stable region of αδFe + Cr_7C_3 and enlarge the stable region of σ phase and α ’phase.