Softening mechanism of P91 steel weldments using heat treatments

• Autorzy: Pandey Chandan , Mahapatra Manas Mohan , Kumar Pradeep , Daniel F. , Adhithan B.

Identyfikatory

DOI

10.1016/j.acme.2018.10.005

• Języki publikacji: EN

Abstrakty

EN

The tungsten inert gas welded P91 steel welded joints were subjected to the two different type of heat treatments including the postweld direct tempering (PWDT) and re-austenitizing based tempering (PWNT) treatment. The microstructure of weld fusion and heat affected zone (HAZ) were characterized in different heat treatment conditions using optical microscope and scanning electron microscope. For as-welded joint, a great heterogeneity was observed in microstructure and mechanical properties across the weldments. The Charpy toughness of the as-welded joint was measured much lower than the minimum recommended value of 47 J and it was measured 8 ± 5 J. The PWHTs have found a beneficial effect in decreasing the microstructure heterogeneity across the welded joint and improving the mechanical properties. The PWDT resulted in a drastic improvement in the Charpy impact toughness of the welded joint and it was measured 59 ± 5 J which was higher than the minimum required value of 47 J but still inferior than the base metal. The δ ferrite still remained in overlap zone of the weld fusion zone. The PWNT treatment resulted in homogeneous microstructure and hardness variation across the welded joint in transverse direction and Charpy impact toughness (149 ± 6 J) exceeded than that achieved in base metal.

Słowa kluczowe

EN

P91 steel; PWHTs; ferrite; Charpy impact toughness; TIG

PL

stal; odporność na uderzenie; obróbka cieplna złączy spawanych

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2019
• Tom: Vol. 19, no. 2
• Strony: 297--310
• Opis fizyczny: Bibliogr. 35 poz., fot., rys., tab., wykr.

Twórcy

autor

Pandey Chandan

• Department of Mechanical Engineering, SRM IST Delhi NCR Campus, Modinagar, Uttarpradesh 201204, India

autor

Mahapatra Manas Mohan

• School of Mechanical Sciences, Indian Institute of Technology Bhubaneswar, Odisha 751013, India

autor

Kumar Pradeep

• Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttrakhand 247667, India

autor

Daniel F.

• Department of Mechanical Engineering, SRM IST Delhi NCR Campus, Modinagar, Uttarpradesh 201204, India

autor

Adhithan B.

• Department of Mechanical Engineering, SRM IST Delhi NCR Campus, Modinagar, Uttarpradesh 201204, India

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