246 Prakt. Met. Sonderband 46 (2014) 
n pot i ul a INTER 
zn WM win PWT 80: ZZ WM. wit PWHT DEFO! 
< 2504 = 
5 2004 < Or M. Kos*, 
= S ; , 
S 4504 > 405 
5 2 *Faculty of 
N 10 3 20- **Svkofin d 
N 50 
0 — _ —_—r —Tr 7] Ov — eT 
n 200 400 600 800 1000 1200 1400 0 200 400 600 800 1000 1200 1400 
a) Time / h b) Time / h ABSTR 
350 BW, without PWHT * 30 T= mre 
300 - 767 WM, without PWHT 300 oa The stud 
E 250 —0— WM, with PWHT E 250 ~7= WM. with PWHT alloy dur 
B oo. a metastab 
% N © 20 is preser 
Og 150 | Je 150- depth of | 
= 3 ; 
5 1005 5 100- used in 
5 504 a 50- microstru 
0: angular p 
N —_—T 1 pe —— rr} . 
0 200 400 600 800 1000 1200 1400 0 0 200 400 600 800 1000 1200 1400 strain thr 
c) Time /h d) Time /h obtained 
mechanis 
Fig. 4: Changes of the precipitates size of a) M23Cg carbides within the grain (Gl); b) ¥ microstru 
phase within the grain (Gl); c) M23Ce carbides at grain boundaries (GB), d) MeC carbides 
at grain boundaries (GB) Key word 
4. SUMMARY 
In this work the deformation, failure and precipitation behaviour of welded joints of 1. INTR 
Alloy 617 were investigated. Due to the temperature exposure at 700 °C the microstructure 
of the material changes and is unstable in the investigated temperature and time range as Mater ials 
a consequence of the formation of carbides and y phase. Therefore the hardness increase stability a 
and limited deformability must be expected in all areas of the weld during high temperature few years 
use. A PWHT applied at 980 °C after welding causes the stabilization of the microstructure building I 
and an increase of the deformation capability in all areas of the welded joints. mentione 
conductiv 
other har 
REFERENCES temperat. 
To improv 
[1] Schmidt, K., Klenk. A., Roos, E., ,Qualifying Materials for the 700 /720°-Power Plant- uch as $ 
Results from MARCKO700, Part 1: Materials“. VGB PowerTech Journal 1-2, 2012, mechan 
p.74 
[2] Speicher, M. et al., ,Untersuchungen zum langzeitigen Festigkeitsverhalten von eos the 
Rohren und Schmiedeteilen aus Nickelbasis-Legierungen®, Final report, 2013 An attr 
[8] Component test facility for a 700 °C power plant (Comtes 700), Final report 2013 pa ice 
and alloy: 
attractive 
micro str