Investigation on Microstructures of Multipass Deposited Metal for 9Cr-1Mo Ferritic Steels
| Periodical | Materials Science Forum (Volume 652) |
|---|---|
| Main Theme | Mechanical Stress Evaluation by Neutrons and Synchrotron Radiation |
| Edited by | Y. Akiniwa, K. Akita and H. Suzuki |
| Pages | 270-274 |
| DOI | 10.4028/www.scientific.net/MSF.652.270 |
| Citation | H.H. Wang et al., 2010, Materials Science Forum, 652, 270 |
| Online since | May, 2010 |
| Authors | H.H. Wang, Kai Ming Wu |
| Keywords | 9 Cr Ferritic Steels, Evolution, Microstructure, Multipass Deposited Metal, Precipitation |
| Price | US$ 28,- |
The microstructures of multipass deposited metal for 9Cr-1Mo ferritic steels were investigated. Columnar martensites and a number of film austenites retained along the lath of martensite comprised primary microstructure. -ferrite was formed and the volume fraction of -ferrite increased as the chromium equivalent (Creq) of steel composition increased. Subjected to weld heating, the primary microstructure transformed. “Weld bead heat-affected zone (WBHAZ)” was thus formed. The morphology of -ferrite changed and columnar martensite grains were broken in sub-zone I and II of WBHAZ. The size and amount of -ferrite reduced because of austenitization and growth of austenite in sub-zone III of WBHAZ. Retained austenite morphology changed from film into island-like in sub-zone IV and martensite tempered to some degree in sub-zone V of WBHAZ. The precipitation and evolution of M23C6, MX and Laves phase by means of neutron diffraction is to be conducted in the future.
