Enhancement Mechanism of Cerium in 316LN Austenitic Stainless Steel During Creep at 700 °C |
| |
| Authors: | Renxian Yang Xin Cai Leigang Zheng Xiaoqiang Hu Dianzhong Li |
| |
| Affiliation: | 1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China |
| |
| Abstract: | Effect of cerium (Ce) on creep strength and microstructure of 316LN austenitic stainless steel (316LN steel) at 700 °C/150 MPa was investigated by scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM) and thermodynamic calculations. Addition of 0.032 wt% Ce to 316LN steel results in a prominent increase in creep life from 313 to 556 h. Ce enriches in titanium nitride nanoparticles, increases slightly the activity and diffusion coefficient of Mo, and facilitates the formation of fine and dense intragranular Laves phase precipitates. Thus the creep strength is remarkably enhanced by Ce addition in 316LN steel through the intragranular Laves phase precipitation strengthening. It reveals a new insight into the improvement effect of rare earth (RE) elements such as Ce on creep strength of austenitic stainless steels, which inspired the design of RE-microalloying heat-resistant steels. |
| |
| Keywords: | 316LN austenitic stainless steel Rare earth Creep Laves phase Precipitation strengthening |
|
| 点击此处可从《金属学报(英文版)》浏览原始摘要信息 |
|
点击此处可从《金属学报(英文版)》下载全文 |
|
