Improvement in Creep Strength of Heat-Resistant Ferritic Steel Precipitation-Strengthened by Intermetallic Compound

Yoshiaki Toda; Hideaki Kushima; Kazuhiro Kimura; Fujio Abe

doi:10.4028/www.scientific.net/MSF.539-543.2994

Paper Titles

Effect Factors of Internal Stress and Deformation Mechanism for Single Crystal Nickel-Base Superalloys during Creep
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Effect of Ausageing on the Precipitation Behavior of MX Carbonitride in Modified 9Cr-1Mo Steel
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Effect of Boron on Microstructure and Creep Deformation Behavior of Tempered Martensitic 9Cr Steel
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Interaction of Recrystallization and Precipitation during Hot Forming of Alloy 80A
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Improvement in Creep Strength of Heat-Resistant Ferritic Steel Precipitation-Strengthened by Intermetallic Compound
p.2994

Contribution of Z-Phase Precipitation to Recovery of Martensitic Structure in High Chromium Creep Resistant Steel
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Two-Phase Microstructures of Gamma+Gamma-Prime Formed by Phase-Separations due to Heat-Treatments of Elastically Constrained Ni-Al-Ti Alloys
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Novel Concept of Austenitic Heat Resistant Steels Strengthened by Intermetallics
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On Bainite Transformation Kinetics and Mechanism
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HomeMaterials Science ForumMaterials Science Forum Vols. 539-543Improvement in Creep Strength of Heat-Resistant...

Improvement in Creep Strength of Heat-Resistant Ferritic Steel Precipitation-Strengthened by Intermetallic Compound

Abstract:

The effects of nickel content and heat treatment conditions on the creep strength of precipitation-strengthened 15Cr ferritic steel were investigated. The creep strength of the 15Cr ferritic steel was drastically improved by solution treatment and water quenching. However, over the long term, the detrimental effect of nickel on the creep strength was pronounced for water-quenched steels. The volume fraction of martensite phase increased with increased nickel content in both the furnace-cooled and water-quenched steels. The volume fraction of martensite phase in the water-quenched steel was smaller than that in the furnace-cooled type, even for the same nickel content. Fine particles, smaller than 500 nm, were precipitated homogeneously within the ferrite phase of the water-quenched steel. On the other hand, coarse block-like particles 1 $m in size were precipitated sparsely within the martensite phase. The creep strength of the steels decreased with increased volume fraction of the martensite phase caused by furnace cooling and nickel addition. The lower creep strength and microstructural stability of the martensite phase is attributable to less precipitation strengthening. To enable this steel to be put to practical use, it will be necessary to suppress the formation of the martensite phase caused by addition of nickel by optimizing the chemical composition and heat treatment conditions.

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Periodical:

Materials Science Forum (Volumes 539-543)

Pages:

2994-2999

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.539-543.2994

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Online since:

March 2007

Authors:

Yoshiaki Toda, Hideaki Kushima, Kazuhiro Kimura, Fujio Abe

Keywords:

15 Mass% Chromium, Ferrite Matrix, Furnace Cooling, Laves Phases, Martensite Phase, Nickel Content, Water Quenching, X-Phase

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