Next Article in Journal
Root Cause Analysis of Surface Cracks in Heavy Steel Plates during the Hot Rolling Process
Next Article in Special Issue
Failure-Analysis Based Redesign of Furnace Conveyor System Components: A Case Study
Previous Article in Journal
Copper Dissolution from Black Copper Ore under Oxidizing and Reducing Conditions
Previous Article in Special Issue
Comparative Study of Chip Formation in Orthogonal and Oblique Slow-Rate Machining of EN 16MnCr5 Steel
Open AccessFeature PaperArticle

Aging Phenomena during In-Service Creep Exposure of Heat-Resistant Steels

Department of Mechanical Engineering, Khalifa University, Abu Dhabi 127788, UAE
Department of Mechanical Engineering, University of Thessaly, Volos 38334, Greece
Center for Catalysis and Separations, Khalifa University, Abu Dhabi 127788, UAE
Author to whom correspondence should be addressed.
Metals 2019, 9(7), 800;
Received: 17 June 2019 / Revised: 11 July 2019 / Accepted: 17 July 2019 / Published: 19 July 2019
(This article belongs to the Special Issue Failure Mechanisms in Alloys)
An investigation of aging phenomena during creep exposure has been conducted for HP-Nb cast reformer tubes for several exposure conditions. Aging was manifested by carbide precipitation, carbide coarsening, and carbide transformation. The transformation of primary M7C3 to the more stable M23C6 carbide takes place at high exposure temperature (910 °C and above). The primary MC carbides transform to the Ni-Nb silicide or G-phase during creep exposure. The presence of Ti in the steel prevented the transformation of MC carbides to the G-phase. Morphological changes like needle to globular transitions, rounding of carbide edges, and carbide coarsening take place during creep exposure. The room-temperature tensile elongation and ultimate tensile strength are significantly reduced during creep exposure. The above aging phenomena are precursors to creep damage. View Full-Text
Keywords: creep; steam reforming; carbides; G-phase; aging; cast reformer tubes creep; steam reforming; carbides; G-phase; aging; cast reformer tubes
Show Figures

Figure 1

MDPI and ACS Style

Haidemenopoulos, G.N.; Polychronopoulou, K.; Zervaki, A.D.; Kamoutsi, H.; Alkhoori, S.I.; Jaffar, S.; Cho, P.; Mavros, H. Aging Phenomena during In-Service Creep Exposure of Heat-Resistant Steels. Metals 2019, 9, 800.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Search more from Scilit
Back to TopTop