TY - JOUR

T1 - Influence of deformation, microstructure, and temperature on the fracture resistance of technically pure tungsten

AU - Gludovatz, B.

AU - Wurster, S.

AU - Hohenwarter, Anton

AU - Hoffmann, Andreas

AU - Pippan, Reinhard

N1 - Publisher Copyright: © 2024 The Author(s)

PY - 2024/5/11

Y1 - 2024/5/11

N2 - The fracture resistance of technically pure W with pre-deformed and recrystallized microstructures was tested in a temperature range of ambient to 700 °C. To account for the impact of microstructure anisotropy, samples with different specimen orientations were investigated. Room temperature tests were carried out in a scanning electron microscope and at elevated temperatures in a vacuum furnace. Both, microstructure and testing temperature significantly influence the fracture resistance of W and a strong dependence of the crack propagation resistance on the crack plane orientation was found. Pre-deformation of the testing material increases the fracture resistance in terms of the crack initiation toughness but shortens the measurable crack resistance curve (R-curve). Testing at elevated temperatures results in higher initiation toughness for both states, pre-deformed and recrystallized; however, only the recrystallized structure shows an R-curve behavior for the used sample geometry.

AB - The fracture resistance of technically pure W with pre-deformed and recrystallized microstructures was tested in a temperature range of ambient to 700 °C. To account for the impact of microstructure anisotropy, samples with different specimen orientations were investigated. Room temperature tests were carried out in a scanning electron microscope and at elevated temperatures in a vacuum furnace. Both, microstructure and testing temperature significantly influence the fracture resistance of W and a strong dependence of the crack propagation resistance on the crack plane orientation was found. Pre-deformation of the testing material increases the fracture resistance in terms of the crack initiation toughness but shortens the measurable crack resistance curve (R-curve). Testing at elevated temperatures results in higher initiation toughness for both states, pre-deformed and recrystallized; however, only the recrystallized structure shows an R-curve behavior for the used sample geometry.

KW - Crack resistance (R-curve) behavior

KW - Inter and transgranular failure

KW - Microstructure and deformation characteristics

KW - Tungsten

UR - http://www.scopus.com/inward/record.url?scp=85193430778&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2024.146631

DO - 10.1016/j.msea.2024.146631

M3 - Article

AN - SCOPUS:85193430778

VL - 902.2024

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

SN - 0921-5093

IS - June

M1 - 146631

ER -