Microstructural refinement through multipass GTAW process
The present work was undertaken to illustrate and clarify the microstructural features of martensitic Fe-Ni weld deposits made by a multipass welding process. To simulate this, rapid thermal treatments were applied to an Fe-12Ni-0.25Ti alloy using an induction furnace and bead-on-plate welding. The rapid thermal treatment refines the microstructure significantly by destroying the previous packet structure. Hence, the term ''packet refinement'' is used to distinguish its microstructural features from the grain refinement associated with recrystallization of austenite. During multipass GTAW process with an 11% Ni ferritic filler wire, a coarse columnar grain structure is formed after solidification but this structure is refined repetitively by the rapid thermal cycles of subsequent passes. The result is a fully packet refined and extremely fine structure, in the order of several microns, throughout the weldment.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5339021
- Report Number(s):
- LBL-21354; CONF-860594-10; ON: DE86015134
- Resource Relation:
- Conference: ASM international trends in welding research meeting, Gatlinburg, TN, USA, 18 May 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NICKEL STEELS
GAS TUNGSTEN-ARC WELDING
GRAIN REFINEMENT
HEAT AFFECTED ZONE
MICROSTRUCTURE
THERMAL CYCLING
TITANIUM ADDITIONS
WELDED JOINTS
ALLOYS
ARC WELDING
CRYSTAL STRUCTURE
FABRICATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
NICKEL ALLOYS
STEELS
TITANIUM ALLOYS
WELDING
ZONES
360101* - Metals & Alloys- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies