Journal Published Online: 24 September 2018
Volume 7, Issue 1

Grain Refinement of P91 Steel Using Double Austenitization Treatment

CODEN: MPCACD

Abstract

The effect of conventional normalizing and tempering (CNT) and double austenitization–based normalizing and tempering (DNT) heat treatments on the microstructure evolution and mechanical properties of creep strength–enhanced ferritic P91 steel were studied. CNT treatment was performed at 1,050°C and air cooled for 1 h and also at 760°C and air cooled for 2 h. In double austenitization–based normalizing heat treatment, steel was austenitized at 1,050°C and air cooled for 1 h and then normalized in a temperature range of 950°C –1,150°C for 1 h followed by water quenching. After the double normalizing, tempering is performed at 760°C for 2 h. A DNT treatment resulted in homogeneous microstructure formation that led to improved mechanical properties as compared to CNT treatment. The incomplete dissolution of precipitates in single-stage tempering resulted in incomplete martensitic structure formation.

Author Information

Pandey, Chandan
Department of Mechanical Engineering, SRM IST-Delhi NCR Campus, Modinagar, India
Mahapatra, M. M.
School of Mechanical Sciences, Indian Institute of Technology, Bhubaneswar, Odisha, India
Kumar, Pradeep
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttrakhand, India
Saini, N.
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttrakhand, India
Thakre, J. G.
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttrakhand, India
Kumar, Prakash
Department of Production Engineering, Birla Institute of Technology, Mesra, Jharkhand, India
Pages: 11
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Details
Stock #: MPC20180094
ISSN: 2379-1365
DOI: 10.1520/MPC20180094