Measurement of prior austenite
grain size was in reasonable agreement of the size calculated for the time and temperature that the steel was held prior to quenching (Table 2).
The relatively lower wear of the SS-CrC type hardfacings, stress-induced martensitic transformation of the retained austenite
, which happens during the wear test , may be suggested as the most probable cause.
To measure the volume deduction of the retained austenite
according to the ASTM E975 standard, X-ray and X'pert HighScore Plus software were used .
The dual-pass seam weld from the vintage X52 pipe has elongated prior austenite
grains, also highly variable in size.
structure is rigid and has a high Young's modulus.
Khan, Microscopic determination of austenite
in 18% Ni Maraging steels, Metals and Materials, 1, 227 (1985).
That is to say, the strength and impact toughness of 34CrNiMo6 steel can be improved with refinement of the prior austenite
Moreover, the microstructure adjacent to the fusion line shows that the microstructure of the welded zone is relatively finer compared with the BM, and there also exists black granular troostite in the grain boundary of austenite
The first two, with [M.sub.s] smaller than Mf, indicate the temperatures at which the transformation of austenite
to martensite starts and finishes during cooling.
In fact, actually, the austenite
phase is metastable at room temperature and becomes unstable when an external mechanical or thermal energy is introduced.
in the final microstructure of advanced steels is an important phase which provides a combination of strength and ductility.
This results in a microstructure of lightly tempered martensite, primary carbides, and up to 12-17% retained austenite
She had just converted me to an Austenite
, for life!
Carbides with a typical hardness of 1700 HK (Knoop micro hardness) are dispersed in a ductile eutectic austenite
Its property is unique only in shape memory alloys, NiTinol wire returns to original shape due to transformation from martensite phase low temperature to austenite
phase high temperature.