Evaluation of creep rupture behaviour for weld joint and base metal of the Cr35Ni45Nb alloy

ABSTRACT

In order to investigate microstructure and creep rupture strength of a weld joint after aging, Cr35Ni45Nb alloy tubes were welded by the GTAW process of two-type filler metals. The tensile test, hardness and creep test were conducted to analyse the mechanical properties of the weld joint and base metal. The results show that the creep rupture time of the base metal at 1373 K is longer than a new weld joint, while the tensile properties of the base metal at room temperature are similar to a new weld joint. With aging, the microstructure of the weld metal and the base metal tended to be homogeneous, the creep rupture time of the weld joint improved and was similar to that of the base metal.

KEYWORDS:

• Weld joint
• aging
• Cr35Ni45Nb alloy
• creep rupture time
• carbide
• GTAW
• fusion boundary
• filler metal

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Jingfeng Guo http://orcid.org/0000-0001-9338-424X

Tieshan Cao http://orcid.org/0000-0001-8655-5864

Additional information

Funding

This research was supported by the National High-tech Research and Development Project of China [grant number 2015AA034402] and the National Natural Science Foundation of China [grant number U1610256].