Abstract
Martensitic 9-12 wt. % Cr steels have been favoured grades for high temperature components in thermal power generation industry. The excellent creep properties of these steel grades can be related to their optimized martensitic microstructure containing ? nely dispersed precipitates. In the present work, the in? uence of weld thermal cycle and subsequent post-weld heat treatment on precipitate evolution of a martensitic 9 wt. % Cr steel is investigated. The microstructure at different stages of the thermal cycle is characterized by optical microscopy, scanning electron microscopy and transmission electron microscopy. The precipitates are identi? ed by analytical transmission microscopy, namely energy-? ltered TEM, energy dispersive X-ray diffraction and electron energy loss spectroscopy. The experimental ? ndings are compared to kinetic simulations of the precipitate evolution during the complete thermal cycle using the software MatCalc. Results of kinetic simulations are in good agreement with experimental data. Optimization of heat treatment procedure as well as further application of microstructure modelling is discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 70-77 |
| Number of pages | 8 |
| Journal | Welding in the World |
| Volume | 55 |
| Issue number | 5-6 |
| DOIs | |
| State | Published - 2011 |
| Externally published | Yes |
Keywords
- Coarse grained heat affected zone
- Martensitic stainless steels
- Microstructure
- Post weld heat treatment
- Simulating