Origin of low temperature toughness in a 12Cr-10Ni martensitic precipitation hardenable stainless steel

Though ductile to brittle transition (DBT) is a typical feature of body centered cubic materials, the present 12Cr-10Ni precipitation hardened martensitic stainless steel exhibited excellent low temperature impact toughness. This was, however, dependant on the aging temperature. 250°C aging led to h...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2018-01, Vol.709, p.1-8
Main Authors: Anoop, C.R., Prakash, Aditya, Narayana Murty, S.V.S., Samajdar, Indradev
Format: Article
Language:English
Subjects:
Aging
Brittleness
Coarsening
Ductile to brittle transition
Ductile-brittle transition
Ductility
Fracture mechanics
Hardenability
Impact strength
Impact toughness
Low temperature
Martensite
Martensitic stainless steel
Martensitic stainless steels
Precipitate coarsening
Precipitates
Precipitation hardening steels
Size distribution
Toughness
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Summary:Though ductile to brittle transition (DBT) is a typical feature of body centered cubic materials, the present 12Cr-10Ni precipitation hardened martensitic stainless steel exhibited excellent low temperature impact toughness. This was, however, dependant on the aging temperature. 250°C aging led to higher toughness both at room temperature and at −196°C (77K). Specimens aged at 400 and 500°C, on the other hand, displayed significantly lower sub-zero impact properties. Though martensite packet size, and size distribution, were identical between the two ageing treatments; there was clear evidence of second phase coarsening: from very fine precipitates of less than ~ 10nm to relatively coarser second phase of ~ 5–25nm range. It is suggested that precipitate coarsening and associated loss of coherency are the limiting factors to the DBT performance of this important class of material.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.10.032