Abstract
A series of AISI 420 stainless steel deposits were prepared by laser solid forming under different oxygen partial pressures. The variation of the oxygen concentration of the deposit with the oxygen partial pressure was investigated. It is found that the purification occurs when the oxygen partial pressure is lower than a certain threshold. By considering the transfer of gaseous oxides in gas phases, a novel mechanism was developed to explain the purification. The predicted oxygen adsorption/desorption behavior shows a reasonable consistent with the experiment result. It is indicated that volatile oxides play a significant role in the purification. The decrease of the oxygen partial pressure and increase of the contents of elements forming volatile oxides and the original oxygen in the deposited material all promote the purification.
Original language | English |
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Pages (from-to) | 1035-1040 |
Number of pages | 6 |
Journal | Materials and Design |
Volume | 89 |
DOIs | |
State | Published - 5 Jan 2016 |
Keywords
- AISI 420 stainless steel
- Laser solid forming
- Oxygen partial pressure
- Purification
- Volatile oxides