Abstract
The influence of microstructure on the strength and toughness of 17-4 Precipitation-Hardened (PH) Stainless Steel (SS) was studied as a function of duration of ageing at 783 K. Lath martensite is formed in this steel in its solution-annealed condition. X-ray diffraction studies detected the formation of a copper-rich phase after ageing for 0.25 h, with the amount of the copper-rich precipitates increasing with the duration of ageing. The coarsening of the copper-rich precipitates on ageing for 2 h led to a sharp decrease in hardness, which was attributable to the transformation of the coherent copper-rich body centred cubic (b.c.c.) phase to the incoherent copper rich face centred cubic (f.c.c.) phase. Further ageing for 4 h led to a dip in hardness and strength and an increase in toughness. The dip in hardness upon long-term ageing could be attributed to the formation of coarse copper-rich precipitates, which also led to an improvement in the toughness of the material. Copyright © 2009, Inderscience Publishers.
| Original language | English |
|---|---|
| Journal | International Journal of Nuclear Energy Science and Technology |
| Volume | 4 |
| Issue number | 4 |
| Pages (from-to) | 355-365 |
| ISSN | 1741-637x |
| DOIs | |
| Publication status | Published - 2009 |