Abstract
Fatigue of Niobium stabilized austenitic stainless steel
(X6CrNiNb1810 mod) is studied using specimens extracted
from a solution annealed and quenched primary piping
material sample. This paper reports and discusses new
results complementing the data published in PVP2009 and
2011, where good long life performance was demonstrated
and relevance of the new design curve in ASME III was
questioned. Effects of temperature and operational
loading sequences are in focus here. A typical case with
steady state operation between fatigue cycles was roughly
simulated in periodically interrupted tests. An extension
of fatigue life due to hardening during the holds in
elevated temperature was demonstrated and here we show
that the hardening effect is generic. It occurs also in
isothermal conditions, where straining and holds are both
at 325 °C, irrespective of the phase within a cycle,
where the hold is introduced, and also for other
austenitic steel grades. Fatigue assessment based on
standard fatigue data seems to underestimate fatigue
performance of materials subjected to typical thermal
transients in nuclear piping during operation.
| Original language | English |
|---|---|
| Title of host publication | ASME 2012 Pressure Vessels and Piping Conference |
| Subtitle of host publication | Volume 1: Codes and Standards |
| Publisher | American Society of Mechanical Engineers (ASME) |
| Pages | 173-181 |
| Volume | 1 |
| ISBN (Print) | 978-0-7918-5500-3 |
| DOIs | |
| Publication status | Published - 2012 |
| MoE publication type | A4 Article in a conference publication |
| Event | ASME 2012 Pressure Vessels and Piping Conference, PVP 2012 - Toronto, ON, Canada Duration: 15 Jul 2012 → 19 Jul 2012 |
Conference
| Conference | ASME 2012 Pressure Vessels and Piping Conference, PVP 2012 |
|---|---|
| Abbreviated title | PVP 2012 |
| Country/Territory | Canada |
| City | Toronto, ON |
| Period | 15/07/12 → 19/07/12 |