Effect of post-weld heat treatment on the joint of friction-welded 1MnCrMoNi steel

Abstract

The microstructural evolution, mechanical and electrochemical properties of the rotary friction welding joint of 1MnCrMoNi maraging steel were investigated after post-weld heat treatment (PWHT). The joint could be divided into two zones: weld zone and thermo-mechanically affected zone. After PWHT, the parallel alignment of the laths turned ‘blurred’; sub-grain and cell structure appeared; M23C6 and $\epsilon$-Cu precipitated, respectively; the joint was softened. But the microhardness was still higher than that of base materials and distributed unevenly. The closer it was to the weld centre, the higher the microhardness was. No deformation occurred in the joints during tensile test, indicating the excellent bonding strength. PWHT process slightly reduced the impact toughness and corrosion resistance of the joint.

KEYWORDS:

• 1MnCrMoNi maraging steel
• rotary friction welding
• heat treatment
• microstructure
• precipitation
• mechanical properties
• polarisation

Acknowledgement

Financial supports of the Fundamental Research Funds for the Central Universities (3072020CFT0702) are gratefully acknowledged.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work was supported by Fundamental Research Funds for the Central Universities, grant number 3072020CFT0702.