中北大学学报（自然科学版）2023，Vol.44Issue(6)：692-698,7.DOI:10.3969/j.issn.1673-3193.2023.06.014
奥氏体化温度对铁素体耐热钢时效过程中微观组织演化的影响
Effects of Austenitizing Temperature on the Microstructure Evolution of Modified Ferritic Heat Resistant Steel Upon Aging Treatment
摘要
Abstract
Austenitizing temperature has significant effects on the regulation of δ-ferrite in ferritic heat resistant steels.To clarify the thermal stability of δ-ferrite in ferrite heat-resistant steels,this work has studied the influence of austenitizing temperature(1 050 ℃ and 1 200 ℃)on the microstructure evolu-tion of modified ferritic heat resistant steel upon aging treatment at 650 ℃.By the means of optical mi-croscope,scanning electron microscopy and transmission electron microscopy,the matrix structure and second phases particles of the modified ferritic heat resistant steel under various conditions were exam-ined.The results indicate that the amount of δ-ferrite increases with the austenitizing temperature in-creasing,and needle-like MX is formed within the δ-ferrite.Laves phase is distributed along prior aus-tenite grain boundaries,martensitic lath boundaries,δ-ferrite boundaries or within δ-ferrite interior,at the aging time of 2 000 h.Large-sized M23C6 has a beneficial effect on the nucleation of Laves phase.The size of Laves phase increases with the increase of austenitizing temperature.Austenitizing tempera-ture has stronger effect on the size of Laves phase than those of M23C6 and MX carbonitrides.MX carbo-nitrides have better thermal stability than Laves phase and M23C6.关键词
铁素体耐热钢/Laves相/δ-铁素体/碳化物Key words
ferritic heat resistant steel/Laves phase/δ-ferrite/carbides分类
矿业与冶金引用本文复制引用
高俊华,杜云飞,赵宇,李国栋,周晓胜..奥氏体化温度对铁素体耐热钢时效过程中微观组织演化的影响[J].中北大学学报（自然科学版）,2023,44(6):692-698,7.基金项目
中北大学重点实验室研究基金资助项目(202104010910020),山西省研究生创新项目(2023KY576) （202104010910020）
