Page 90 - Handbook of Materials Failure Analysis
P. 90
84 CHAPTER 4 Creep damage of high alloyed reformer tubes
service,
from to
taken due circular
B), almost
(type service degradation negligible and (b)
Sample B4 (low deformation) Sample B6 (high deformation) long-term after shows B4 boundary grain at
(type and A) Sample degradation. carbide primary
conditions (a) grains
as-cast corresponding inside
the in and precipitation
Sample A (virgin material) Sample B3 (high deformation) samples of magnification deformations carbide fine
high diameter different a show B6
at and
micrographs with B3 (c).
4.12 segments samples
FIGURE Optical tube while microvoids
