Effect of welding heat input on microstructure and properties of TC4 titanium alloy ultra-narrow gap welded joint by laser welding with filler wire

A 10 mm narrow gap TC4 titanium alloy welded joint by laser welding with filler wire was obtained by different welding heat inputs. The microstructures of the welded joint were analyzed by OM, SEM, XRD and EBSD. The mechanical properties of the welded joint were analyzed by microhardness test and te...

Full description

Saved in:
Bibliographic Details
Published in:Materials research express 2021-01, Vol.8 (1), p.16511
Main Authors: Fang, Naiwen, Guo, Erjun, Huang, Ruisheng, Yin, Limeng, Chen, Yongsheng, Zeng, Caiyou, Cao, Hao, Zou, Jipeng, Xu, Kaixin
Format: Article
Language:English
Subjects:
Base metal
Elongation
Fillers
Grain size
Heat affected zone
heat input
Heat treating
Laser beam welding
laser welding with filler wire
Lasers
Mechanical properties
mechanical property
Microhardness
microstructure
TC4 titanium alloy
Tensile strength
Tensile tests
Titanium alloys
Titanium base alloys
Welded joints
Wire
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A 10 mm narrow gap TC4 titanium alloy welded joint by laser welding with filler wire was obtained by different welding heat inputs. The microstructures of the welded joint were analyzed by OM, SEM, XRD and EBSD. The mechanical properties of the welded joint were analyzed by microhardness test and tensile test. The results show that with the increase of laser welding heat input, the average grain size and width of the equiaxed crystal zone in the center of the weld increases, the grain angle in the columnar crystal zone gradually tends to be perpendicular to the center of the weld, and the width of the heat affected zone (HAZ) increases without obvious grain coarsening. The HAZ of the welded joint is softened, and its microhardness value is lower than that of the weld and the base metal. The tensile strength of the welded joint is slightly higher than those of the base metal, but the elongation after fracture is less than that of the base metal, and it decreases with the increase of laser welding heat input.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/abd4b3