Fracture Micro Mechanism of Cryogenically Treated Ledeburitic Tool Steel
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F22%3A00560104" target="_blank" >RIV/68081723:_____/22:00560104 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1007/978-981-16-8810-2_6" target="_blank" >http://dx.doi.org/10.1007/978-981-16-8810-2_6</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/978-981-16-8810-2_6" target="_blank" >10.1007/978-981-16-8810-2_6</a>
Alternative languages
Result language
angličtina
Original language name
Fracture Micro Mechanism of Cryogenically Treated Ledeburitic Tool Steel
Original language description
Fracture micro mechanism of cryogenically treated Cr-V ledeburitic tool steel was studied on fracture toughness testing specimens, by using the scanning electron microscopy and microanalysis. Experimental steel has been processed at different combinations of cryogenic temperatures (from the range75 to269 degrees C) and tempering regimes, producing different microstructures (martensite, retained austenite, carbides), hardness- and fracture toughness values (from the ranges 700-1000 HV and 13-20 MPa x m(1/2), respectively). Conventionally quenched the same steel was considered as a reference. Generally, the obtained fracture surfaces manifest combined low-energetic ductile/cleavage crack propagation mode. The low-energetic ductile mode is associated with the presence of small globular carbides (size < 0.3 mu m) that are produced by cryogenic treatments. On the other hand, cleavage mode is more pronounced with increased matrix stiffness, which is caused by the precipitation of nano-scaled transient carbides within the martensite. Also, differences in role of crack propagation between various carbides were determined. These differences are caused by crystallography of these phases as well as by their size. While small globular carbides (cementite) and dominant amount of the eutectic carbides (cubic MC-phase) assist more probably (by 50-60%) in ductile micro mechanism the coarser secondary particles (hexagonal M7C3-phase) are much more prone to cleavage cracking. This tendency increases with decreasing steel hardness since the matrix becomes more plastic, and the carbides cannot deform together with the matrix as they are much more brittle.
Czech name
—
Czech description
—
Classification
Type
D - Article in proceedings
CEP classification
—
OECD FORD branch
20501 - Materials engineering
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
PROCEEDINGS OF THE 9TH INTERNATIONAL CONFERENCE ON FRACTURE, FATIGUE AND WEAR, FFW 2021
ISBN
978-981-16-8809-6
ISSN
2195-4356
e-ISSN
2195-4364
Number of pages
14
Pages from-to
67-84
Publisher name
Springer
Place of publication
Singapore
Event location
Ghent
Event date
Aug 2, 2021
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000833449600006