| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5454787 | Materials Characterization | 2017 | 37 Pages |
Abstract
The precipitation correlation between Nb-rich MC carbides and Nb-rich M2P phosphides has been investigated in a TP347H austenitic stainless steel during rupture test at 750 °C. Needle-like Nb-rich M2P phosphides as well as round-shaped Nb-rich MC is observed during rupture test. The Nb-rich M2P phosphides form an orthorhombic NbNiP-type structure and show the orientation relationship of [01â0]M2P//[100]γ and (201â)M2P//(01â1â)γ. The fraction of the Nb-rich MC carbides decreases abruptly after a critical rupture time, while that of M2P phosphides is roughly little changed. This means that the dissolution of the pre-formed Nb-rich MC carbides into the matrix for meeting the equilibrium phase fraction of each phase activates the active precipitation and growth of the Nb-rich M2P phosphides. Such a precipitation correlation may delay intergranular cracking occurring in the austenitic stainless steel.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Chang-Wan Hong, Yoon-Uk Heo, Nam-Hoe Heo, Sung-Joon Kim,