TY - GEN
T1 - EFFECTS OF GRAIN-BOUNDARY EMBRITTLEMENT ON FRACTURE AND FATIGUE CRACK PROPAGATION IN A LOW ALLOY STEEL
AU - Ritchie, R.O.
AU - Geniets, L.C.E.
AU - Knott, J.F.
PY - 1973/8
Y1 - 1973/8
N2 - This paper is concerned with ways in which segregation of minor impurity elements to prior austenite grain boundaries in quenched and tempered low alloy steels may so reduce boundary cohesion that brittle intergranular fracture is produced in low-temperature mechanical tests. Assessment of the ″degree of temper embrittlement″ in a steel has conventionally been made by measuring the shift in impact transition temperature (FATT), but this procedure is open to many criticisms, the most important of which being that it does not give any absolute measurement of the ease of fracturing a steel in which some degree of grain boundary segregation is present. The present paper examines intergranular fracture events in smooth tensile specimens, in notched bars and in pre-cracked fracture toughness testpieces to decide whether the onset of such fracture can be characterized in a quantitative and consistent manner, which can be related to the steel's microstructure and flow properties.
AB - This paper is concerned with ways in which segregation of minor impurity elements to prior austenite grain boundaries in quenched and tempered low alloy steels may so reduce boundary cohesion that brittle intergranular fracture is produced in low-temperature mechanical tests. Assessment of the ″degree of temper embrittlement″ in a steel has conventionally been made by measuring the shift in impact transition temperature (FATT), but this procedure is open to many criticisms, the most important of which being that it does not give any absolute measurement of the ease of fracturing a steel in which some degree of grain boundary segregation is present. The present paper examines intergranular fracture events in smooth tensile specimens, in notched bars and in pre-cracked fracture toughness testpieces to decide whether the onset of such fracture can be characterized in a quantitative and consistent manner, which can be related to the steel's microstructure and flow properties.
UR - https://www.scopus.com/pages/publications/0015774612
UR - https://www.scopus.com/pages/publications/0015774612#tab=impact
M3 - RGC 32 - Refereed conference paper (with host publication)
VL - 1
T3 - Monograph and report series
SP - 124
EP - 128
BT - The Microstructure and design of alloys
PB - The Institute of Metals
CY - London
T2 - Third International Conference on the Strength of Metals and Alloys
Y2 - 20 August 1973 through 25 August 1973
ER -