Behavior of Nitrogen in GH4169 Superalloy Melt during Vacuum Induction Melting Using Returned Materials
The nitrogen behavior of superalloy melt GH4169 during the vacuum induction melting (VIM) process was clarified by using different proportions of returned materials including block-shaped returned material, chip-shaped returned material, and pure materials to produce a high–purity superalloy melt an...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-07-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/11/7/1119 |
| _version_ | 1797526591493898240 |
|---|---|
| author | Shengyong Gao Min Wang Xiaoyu Xie Meng Liu Yanping Bao |
| author_facet | Shengyong Gao Min Wang Xiaoyu Xie Meng Liu Yanping Bao |
| author_sort | Shengyong Gao |
| collection | DOAJ |
| description | The nitrogen behavior of superalloy melt GH4169 during the vacuum induction melting (VIM) process was clarified by using different proportions of returned materials including block-shaped returned material, chip-shaped returned material, and pure materials to produce a high–purity superalloy melt and provide guidance for the purification of the superalloy melt. For the nitrogen removal during the VIM process, the denitrification rate in the refining period reached 10 ppm per hour on average, which is significantly higher than 1 ppm per hour on average in the melting period. The denitrification reaction of superalloy melt GH4169 under extremely low vacuum pressure is controlled by both the mass transfer of nitrogen in the melt and the chemical reaction of the liquid–gas interface. The nitrogen removal of superalloy melts during VIM occurs through the two methods of gasification denitrification and nitride floatation because the nitrides begin to precipitate in the liquid phase at 1550 °C. A higher nitrogen removal rate can be obtained by increasing the proportion of chip-shaped material or decreasing the proportion of block-shaped material. |
| first_indexed | 2024-03-10T09:32:27Z |
| format | Article |
| id | doaj.art-75b5768caffb4c91a5802c5babcbc58a |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T09:32:27Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-75b5768caffb4c91a5802c5babcbc58a2023-11-22T04:24:04ZengMDPI AGMetals2075-47012021-07-01117111910.3390/met11071119Behavior of Nitrogen in GH4169 Superalloy Melt during Vacuum Induction Melting Using Returned MaterialsShengyong Gao0Min Wang1Xiaoyu Xie2Meng Liu3Yanping Bao4State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaAVIC Shangda, Xingtai 054800, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaThe nitrogen behavior of superalloy melt GH4169 during the vacuum induction melting (VIM) process was clarified by using different proportions of returned materials including block-shaped returned material, chip-shaped returned material, and pure materials to produce a high–purity superalloy melt and provide guidance for the purification of the superalloy melt. For the nitrogen removal during the VIM process, the denitrification rate in the refining period reached 10 ppm per hour on average, which is significantly higher than 1 ppm per hour on average in the melting period. The denitrification reaction of superalloy melt GH4169 under extremely low vacuum pressure is controlled by both the mass transfer of nitrogen in the melt and the chemical reaction of the liquid–gas interface. The nitrogen removal of superalloy melts during VIM occurs through the two methods of gasification denitrification and nitride floatation because the nitrides begin to precipitate in the liquid phase at 1550 °C. A higher nitrogen removal rate can be obtained by increasing the proportion of chip-shaped material or decreasing the proportion of block-shaped material.https://www.mdpi.com/2075-4701/11/7/1119vacuum induction meltingsuperalloydenitrificationreturned materialsnitrides |
| spellingShingle | Shengyong Gao Min Wang Xiaoyu Xie Meng Liu Yanping Bao Behavior of Nitrogen in GH4169 Superalloy Melt during Vacuum Induction Melting Using Returned Materials Metals vacuum induction melting superalloy denitrification returned materials nitrides |
| title | Behavior of Nitrogen in GH4169 Superalloy Melt during Vacuum Induction Melting Using Returned Materials |
| title_full | Behavior of Nitrogen in GH4169 Superalloy Melt during Vacuum Induction Melting Using Returned Materials |
| title_fullStr | Behavior of Nitrogen in GH4169 Superalloy Melt during Vacuum Induction Melting Using Returned Materials |
| title_full_unstemmed | Behavior of Nitrogen in GH4169 Superalloy Melt during Vacuum Induction Melting Using Returned Materials |
| title_short | Behavior of Nitrogen in GH4169 Superalloy Melt during Vacuum Induction Melting Using Returned Materials |
| title_sort | behavior of nitrogen in gh4169 superalloy melt during vacuum induction melting using returned materials |
| topic | vacuum induction melting superalloy denitrification returned materials nitrides |
| url | https://www.mdpi.com/2075-4701/11/7/1119 |
| work_keys_str_mv | AT shengyonggao behaviorofnitrogeningh4169superalloymeltduringvacuuminductionmeltingusingreturnedmaterials AT minwang behaviorofnitrogeningh4169superalloymeltduringvacuuminductionmeltingusingreturnedmaterials AT xiaoyuxie behaviorofnitrogeningh4169superalloymeltduringvacuuminductionmeltingusingreturnedmaterials AT mengliu behaviorofnitrogeningh4169superalloymeltduringvacuuminductionmeltingusingreturnedmaterials AT yanpingbao behaviorofnitrogeningh4169superalloymeltduringvacuuminductionmeltingusingreturnedmaterials |