1 School of Materials Science and Engineering, Hebei University of Engineering, Handan 056038, Hebei, China 2 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 3 High Temperature Materials Research Institute, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China 4 Technology Innovation Center for High Quality Cold Heading Steel of Hebei Province, Hebei University of Engineering, Handan 056038, Hebei, China
Characteristics and stability of oxide + carbonitride in H13 steel at 1250 °C
1 School of Materials Science and Engineering, Hebei University of Engineering, Handan 056038, Hebei, China 2 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 3 High Temperature Materials Research Institute, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China 4 Technology Innovation Center for High Quality Cold Heading Steel of Hebei Province, Hebei University of Engineering, Handan 056038, Hebei, China
摘要 The morphology, size, quantity, and composition of complex oxide + carbonitride in H13 steel held at 1250 °C for 5, 10, and 15 h were determined. The results show that the ratio and number of complex carbonitrides with cores in H13 steel are gradually increased when holding at 1250 °C compared with those in the original H13 steel, and the core size increases. There are one or more oxide cores in (Tix,V1-x)(Cy,N1-y), including xCaO∙zAl2O3, xCaO∙yMgO∙zAl2O3, and CaO after holding at 1250 °C, in addition to MgO∙Al2O3 and Al2O3 in the original steel. The equilibrium temperature for (Tix, V1-x)(Cy,N1-y) precipitation at the solidification front and decomposition in the solid state was theoretically analyzed, which was affected by the x value and the product of Ti and N contents in H13 steel. Meanwhile, the composition of (Tix,V1-x)(Cy,N1-y) is influenced by the oxide cores. It is convinced that (Tix,V1-x)(Cy,N1-y) with oxide cores has a higher stability, especially for oxides with a high Al2O3 content. Heat treatment at high temperature facilitates a more reasonable analysis of oxide + carbonitride, and the generation mechanism of oxide + carbonitride was discussed.
Abstract：The morphology, size, quantity, and composition of complex oxide + carbonitride in H13 steel held at 1250 °C for 5, 10, and 15 h were determined. The results show that the ratio and number of complex carbonitrides with cores in H13 steel are gradually increased when holding at 1250 °C compared with those in the original H13 steel, and the core size increases. There are one or more oxide cores in (Tix,V1-x)(Cy,N1-y), including xCaO∙zAl2O3, xCaO∙yMgO∙zAl2O3, and CaO after holding at 1250 °C, in addition to MgO∙Al2O3 and Al2O3 in the original steel. The equilibrium temperature for (Tix, V1-x)(Cy,N1-y) precipitation at the solidification front and decomposition in the solid state was theoretically analyzed, which was affected by the x value and the product of Ti and N contents in H13 steel. Meanwhile, the composition of (Tix,V1-x)(Cy,N1-y) is influenced by the oxide cores. It is convinced that (Tix,V1-x)(Cy,N1-y) with oxide cores has a higher stability, especially for oxides with a high Al2O3 content. Heat treatment at high temperature facilitates a more reasonable analysis of oxide + carbonitride, and the generation mechanism of oxide + carbonitride was discussed.
Xiao-lin Sun,Han-jie Guo,Jing Guo, et al. Characteristics and stability of oxide + carbonitride in H13 steel at 1250 °C[J]. Journal of Iron and Steel Research International, 2024, 31(1): 134-142.
2024, Vol. 31 
