摘要详情
19 / 2025-03-29 17:26:19
Study on isothermal precipitation kinetics of nitride in a high nitrogen austenitic stainless steel
high nitrogen austenitic steel,isothermal precipitation kinetics,nitride
摘要待审
Steel with nitrogen content of more than 0.4wt % is known as high-nitrogen steel, which is a new material with excellent performance and broad application prospects, among which high-nitrogen chromium-manganese austenitic steel (such as 18Mn18Cr0.5N steel) is currently one of the materials with the best match of strength and toughness in all metal materials in the world. During the "Seventh Five-Year Plan" period, 18Mn18Cr0.5N steel was introduced to manufacture components such as generator rotor protection rings. However, in the actual production of the protective ring, this kind of steel in the high-temperature deformation (such as forging, hot bending, etc.) and the cooling process after deformation, if the carbide or nitride are precipitated from the austenite, its performance will be greatly affected. However, the study on the kinetics, process and type of precipitation of carbide (or nitride) in these steels is not so clear up to now. Therefore, the isothermal precipitation of nitride in 18Mn18Cr0.52N steel was studied in this work to provide a theoretical basis for the formulation of hot deformation and direct treatment process after hot deformation. In present work, the isothermal precipitation of nitride from austenite in 18Mn18Cr0.5N steel at 800 ~ 950℃ has been studied by means of metallography and X-ray diffraction (XRD). The results show that for 18Mn18Cr0.5N steel, there is no nitride precipitation above 950℃, the nose tip temperature of Cr2N isothermal precipitation is about 860℃, and the critical cooling rate without the precipitation is about 0.75℃ / s. The quantitative relationship between Cr2N precipitation (f / %) and austenite lattice constant (aγ/nm) is as: -9.2312×104+5.13683×105aγ－7.14503×105aγ2.
重要日期
-
会议日期
08月19日
2025
至08月22日
2025
-
06月30日 2025
初稿截稿日期
-
08月22日 2025
注册截止日期
主办单位
中国机械工程学会热处理分会
协办单位
《材料热处理学报》
《金属热处理》
《金属热处理》
联系方式
- IFHTSE 2025 OFFICE
- ch******@chts.org.cn
- 010*********
