Hydrogen assisted cracking of palladium modified PH 13-8 Mo stainless steel
We compare the hydrogen assisted cracking resistance of wrought PH 13-8 Mo stainless steel alloyed with 0.4 to 1.0 wt.% palladium to the conventional alloy when aged to yield strengths of 1170--1250 MPa. Pd is found both in solid solution in the martensitic phase and also in the form of randomly distributed, incoherent PdAl precipitates in the modified alloy. Interfacial segregation of Pd to grain boundaries and lath boundaries is not observed. Intergranular hydrogen cracking is suppressed with Pd in slow strain rate tests conducted during electrochemical hydrogen charging of precharged samples. Hydrogen permeation analyses indicate that hydrogen ingress is not inhibited by Pd but that bulk diffusion rates are lowered relative to the conventional alloy. These results are consistent with the creation of a strong hydrogen trap, most likely the uniformly distributed PdAl phase, which lowers the levels of interfacially segregated hydrogen. 15 refs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5651574
- Report Number(s):
- SAND-89-2413C; CONF-8909204--3; ON: DE90001501
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CRYSTAL STRUCTURE
DIFFUSION
ELEMENTS
EMBRITTLEMENT
GRAIN BOUNDARIES
HIGH ALLOY STEELS
HYDROGEN EMBRITTLEMENT
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
PALLADIUM
PALLADIUM ADDITIONS
PALLADIUM ALLOYS
PLATINUM METAL ALLOYS
PLATINUM METALS
PRECIPITATION
SEPARATION PROCESSES
STAINLESS STEELS
STEELS
TENSILE PROPERTIES
TRANSITION ELEMENTS
YIELD STRENGTH