QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
Print ISSN : 0288-4771
The Effects of δ-Ferrite Morphology on Low Temperature Fracture Toughness of Austenitic Stainless Steel Weld Metal
Osamu KamiyaKazuo KumagaiYasushi Kikuchi
Author information
JOURNALS FREE ACCESS

1991 Volume 9 Issue 4 Pages 525-531

Details
Abstract

The effect of δ ferrite morphology and grain boundary property on the low temperature toughness of austenitic stainless steel SUS304L weld metal has been studied. The types of δ ferrite were classified into three categories : vermicular, lacy, and globular. When Charpy test were performed at low temperature, brittle fracture easily occurred in a vermicular type δ ferrite because the longitudinal direction of this δ perallel to [100]δ, that is a cleavage plain.
On the other hand, brittle fracture scarcely occurred in both a globular type and a lacy type δ ferrite, because the the stress concentration must be low at globular type δ and the Kurdjumov-Sachs (K-S) relationship holds between lacy type δ and γ phase. Grain boundary holding the K-S are coherence to grains and hardly cause the decohesion.
The present data indicate that changing the δ ferrite morphology from a vermicular type to lacy type prevents the cleavage fracture and increases the fracture toughness at low temperature.

Information related to the author
© by JAPAN WELDING SOCIETY
Previous article Next article
feedback
Top