Segregation of impurities on grain boundaries in tests of resistance to “reheat and underclad” cracking

The results of AES measurements of the surface composition of intercrystalline fracture facets in low-alloy 3Cr0.7Mo0.3V and 2Cr0.6Mo0.1V1.2Ni steels can be summarized as follows: (1) In 3Cr0.7Mo0.3V steel the segregation of phosphous, and in all probability that of carbon also, was observed after w...

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Bibliographic Details
Published in:Scripta materialia 1997-12, Vol.37 (11), p.1811-1819
Main Authors: Magula, V., Grman, D., Patscheider, J.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Metals. Metallurgy
Physics
Solubility, segregation, and mixing
phase separation
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Summary:The results of AES measurements of the surface composition of intercrystalline fracture facets in low-alloy 3Cr0.7Mo0.3V and 2Cr0.6Mo0.1V1.2Ni steels can be summarized as follows: (1) In 3Cr0.7Mo0.3V steel the segregation of phosphous, and in all probability that of carbon also, was observed after weld thermal cycle simulation (T sub max =1300 deg C, Delta t sub 8/5 =30 S). (2) After long annealing (580 deg C/100 h) of the 3Cr0.7Mo0.3V and 2Cr0.6Mo0.1V1.2Ni steels, the segregation of phosphorus and probably that of carbon took place, resulting in an increased proportion of intercrystalline fracture. (3) Besides the phosphorus and possible carbon segregation, the intercrystalline fractures of 3Cr0.7Mo0.3V and 2Cr0.6Mo0.1V1.2Ni steels formed during isothermal tensile tests also showed a significant sulfur segregation. (4) Segregation of Ag, Sb and Sn to surface concentrations > 2 at.% was not observed.
ISSN:1359-6462
1872-8456
DOI:10.1016/S1359-6462(97)00336-9