Creep resistance of Fe–Ni–Cr heat resistant alloys for reformer tube applications

Materials Science and Technology - Tập 35 Số 16 - Trang 1924-1931 - 2019
Franck Tancret1, Johanne Laigo2, Jader Furtado2
1Institut des Matériaux Jean Rouxel
2Air Liquide [Siège Social]

Tóm tắt

Relations between microstructure, phase transformations and creep resistance of austenitic Fe–Ni–Cr alloys are investigated. As-cast alloys with different silicon contents and an ex-service tube are submitted to laboratory agings to trigger specific phase transformations, and subsequently creep-tested at 950°C under stresses of 24–48 MPa. As-cast microstructures contain interdendritic chromium-rich M7C3 carbides with niobium-rich MC carbides. After aging at 950°C, primary M7C3 carbides transform into chromium-rich M23C6 carbides, associated to a loss in creep strength. The G phase present in the ex-service alloy is reversed into MC carbides by a heat treatment at 1100°C, associated to a slight decrease in creep resistance. Besides, the addition of silicon is highly detrimental to creep strength. Results can be used for alloy design.

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Materials Science and Technology

Tập 35 Số 16

1924-1931

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