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糊状区保温对Cr18Mn18N奥氏体不锈钢析出行为的影响
Effect of Holding in Mushy Zone on Precipitation Behavior of Cr18Mn18N Austenitic Stainless Steel
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- DOI:
- 作者:
- 曹荣 金青林 李省霖 古航贞
CAO Rong;JIN Qinglin;LI Shenglin;GU Hangzhen
- 作者单位:
- 昆明理工大学材料科学与工程学院
College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
- 关键词:
- 糊状区保温 氮含量 显微组织 Σ相
holding in mushy zone nitrogen content microstructure sigma
- 摘要:
- 用糊状区保温增氮工艺制备了Cr18Mn18N奥氏体不锈钢。研究了糊状区保温对Cr18Mn18N合金氮含量和显微组织的影响。结果表明,当氮气压力为0.1 MPa时,随着糊状区保温时间的增加,铸锭中的氮含量由0.161%提高到0.384%,气孔率则从3.69%逐渐降至3.25%。随着氮含量的增加,奥氏体组织的体积分数逐渐增加,铁素体和σ相逐渐减小,当氮含量为0.279%时,完全抑制σ相形核。Cr18Mn18N austenitic stainless steel was prepared by the nitriding process of melting holding in mushy zone. The effect of melting holding in mushy zone on nitrogen content and microstructure of Cr18Mn18N alloy was studied. The results show that the nitrogen content in the ingot increases from 0.161% to 0.384 with the increase of holding time in mushy zone when nitrogen pressure is 0.1 MPa, while the porosity decreases from 3.69% to 3.25%. With the increase of nitrogen content, the volume fraction of austenite structure increases gradually, ferrite and a phase decrease gradually, and when nitrogen content is 0.279%, the nucleation of a phase is completely inhibited.