Microstructure and impact behaviour of ASTM A105/AISI 304L friction weldments

被引：4
|
作者：
Straffelini, G [1 ]
Pellizzari, M
Bernardi, N
机构：
[1] Univ Trent, Dipartimento Ingn Mat & Tecnol Ind, I-38100 Trent, Italy
[2] Tomet SpA, Vicenza, Italy
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2004年 / 20卷 / 05期
关键词：
friction welds; carbon steels; stainless steels; microstructure; impact strength;
D O I：
10.1179/026708304225016699
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Instrumented impact testing has been used to investigate the influence of the microstructure of the heat affected zone (HAZ) on the impact fracture behaviour of ASTM A105/AISI 304L friction weldments. The friction layer in the HAZ has been found to consist of two different parts. In the A105 side, a mechanically mixed layer made of bainite containing 304L `protrusions' is present. The hardness of the bainite was found to increase as the friction pressure was decreased. In the 304L side, the friction layer was made of a thick shear band, formed by thermoplastic instability during welding. The impact fracture toughness was found to depend on both the crack nucleation and propagation stages, whose characteristics were related to the dynamic fracture toughness of the friction layers.
引用
收藏
页码：634 / 640
页数：7
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