Thermal stability of an Ni-Cr-Mo-Nb alloy

H. M. Tawancy

doi:10.1016/1044-5803(92)90084-U

Thermal stability of an Ni-Cr-Mo-Nb alloy

H. M. Tawancy^*

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

A study was conducted to characterize the microstructural changes that occur in an Ni-Cr-Mo-Nb alloy after up to 1000 hours aging at 650°C, 760°C, and 870°C and to determine the corresponding effects on mechanical properties and corrosion resistance. Various techniques of analytical electron microscopy and conventional scanning electron microscopy were used to characterize the microstructure. Mechanical properties were determined from room temperature surface hardness and tensile tests. Resistance to aqueous corrosion was determined from tests in boiling 10% nitric acid. Exposure to all temperatures investigated was found to result in age hardening and a decrease in corrosion resistance of the alloy. However, an overaging effect was observed during the later stages of exposure at 760°C and 870°C. The observed changes in properties were correlated with precipitation of the γ″ and σ phases of Ni₃Nb and an Ni-Mo-Si Laves phase.

Original language	English
Pages (from-to)	221-240
Number of pages	20
Journal	Materials Characterization
Volume	28
Issue number	4
DOIs	https://doi.org/10.1016/1044-5803(92)90084-U
State	Published - Jun 1992

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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abstract = "A study was conducted to characterize the microstructural changes that occur in an Ni-Cr-Mo-Nb alloy after up to 1000 hours aging at 650°C, 760°C, and 870°C and to determine the corresponding effects on mechanical properties and corrosion resistance. Various techniques of analytical electron microscopy and conventional scanning electron microscopy were used to characterize the microstructure. Mechanical properties were determined from room temperature surface hardness and tensile tests. Resistance to aqueous corrosion was determined from tests in boiling 10\% nitric acid. Exposure to all temperatures investigated was found to result in age hardening and a decrease in corrosion resistance of the alloy. However, an overaging effect was observed during the later stages of exposure at 760°C and 870°C. The observed changes in properties were correlated with precipitation of the γ″ and σ phases of Ni3Nb and an Ni-Mo-Si Laves phase.",

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AB - A study was conducted to characterize the microstructural changes that occur in an Ni-Cr-Mo-Nb alloy after up to 1000 hours aging at 650°C, 760°C, and 870°C and to determine the corresponding effects on mechanical properties and corrosion resistance. Various techniques of analytical electron microscopy and conventional scanning electron microscopy were used to characterize the microstructure. Mechanical properties were determined from room temperature surface hardness and tensile tests. Resistance to aqueous corrosion was determined from tests in boiling 10% nitric acid. Exposure to all temperatures investigated was found to result in age hardening and a decrease in corrosion resistance of the alloy. However, an overaging effect was observed during the later stages of exposure at 760°C and 870°C. The observed changes in properties were correlated with precipitation of the γ″ and σ phases of Ni3Nb and an Ni-Mo-Si Laves phase.

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Thermal stability of an Ni-Cr-Mo-Nb alloy

Abstract

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