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Evolution of Inclusions after Cerium and Titanium Addition in Aluminum Deoxidized Fe-17Cr-9Ni Austenitic Stainless Steel
ISIJ International ( IF 1.8 ) Pub Date : 2020-09-25 , DOI: 10.2355/isijinternational.isijint-2020-028
Chao Pan 1 , Xiaojun Hu 1 , Ping Lin 2 , Kuochih Chou 1
Affiliation  

In this study, the effects of the addition of Ce and Ti on the evolution of inclusions in Al deoxidized Fe-17Cr-9Ni austenitic stainless steel were investigated. When the Ce was added before Ti, Al2O3 can be effectively modified into Ce-containing oxides by Ce. With the increase of Ce content, the oxides evolutionary process is as follows: Al2O3 → CeAl11O18 → CeAlO3 → Ce2O3. After the addition of Ti, TiN appeared on the surface of oxides except Ce2O3. When Ti was added before Ce, due to the simultaneous effects of Ti on the modification of smaller size Al2O3 and precipitation of TiN, spherical Al2O3–TiOx inclusion that was completely wrapped by TiN formed. On the other hand, the larger size Al2O3 was not significantly modified by Ti, and cannot completely be wrapped by TiN. After Ce was added, the oxides which were not completely wrapped by TiN were modified to Ce-containing oxides. However, Ce could not modify the oxides that were completely wrapped by TiN.



中文翻译:

铝脱氧Fe-17Cr-9Ni奥氏体不锈钢中铈和钛添加后夹杂物的演变

在这项研究中,研究了添加Ce和Ti对Al脱氧Fe-17Cr-9Ni奥氏体不锈钢中夹杂物演变的影响。当在Ti之前添加Ce时,Al 2 O 3可被Ce有效地改性为含Ce的氧化物。随着Ce含量的增加,氧化物的析出过程为:Al 2 O 3 →CeAl 11 O 18 →CeAlO 3 →Ce 2 O 3。添加Ti后,除了Ce 2 O 3以外,在氧化物的表面上也出现TiN 。当在Ce之前添加Ti时,由于Ti同时作用于较小尺寸的Al的改性2 O 3和TiN的沉淀,形成了被TiN完全包裹的球形Al 2 O 3 -TiO x夹杂物。另一方面,较大尺寸的Al 2 O 3没有被Ti明显地改性,并且不能被TiN完全包裹。添加Ce后,未被TiN完全包裹的氧化物被改性为含Ce的氧化物。然而,铈不能改变被氮化钛完全包裹的氧化物。

更新日期:2020-09-25
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