The main parameters influcencing the creep resistance of advanced 9-12% Cr-Steels for power plant applications

H. Cerjak; P. Hofer; B. Schaffernak; K. Spiradek-Hahn; Günter Zeiler

The main parameters influcencing the creep resistance of advanced 9-12% Cr-Steels for power plant applications

H. Cerjak, P. Hofer, B. Schaffernak, K. Spiradek-Hahn, Günter Zeiler

Graz University of Technology

Research output: Chapter in Book or Conference Proceedings › Book chapter

Abstract

The extrapolation of long term creep ruptre strengths from short term creep tests is particularly problematic for the group of 9-12% steels group, because their martensitic microstructure shows a low stbility at service conditions. During creep as well as under thermal exposure in the range of about 600°C significant microstructural changes occur and can be observed. The martensitic lath structure changes towards a subgrain structure with a low dislocation density, whcih is in accordance with the state of the thermodynamic equilibrium. This evolution is accompanied by the growth of precipitates from the as received state (M22C6) as well as by the formation of the relatively rapidly coarsening Laves phase, which is connected with a matrix depletion of W and Mo.

Original language	German
Title of host publication	Materials for Advanced Power Engineering 1998 Cost Proceedings Part I
Pages	9
Number of pages	1
Publication status	Published - 1998

Research Field

Not defined

Cite this

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title = "The main parameters influcencing the creep resistance of advanced 9-12\% Cr-Steels for power plant applications",

abstract = "The extrapolation of long term creep ruptre strengths from short term creep tests is particularly problematic for the group of 9-12\% steels group, because their martensitic microstructure shows a low stbility at service conditions. During creep as well as under thermal exposure in the range of about 600°C significant microstructural changes occur and can be observed. The martensitic lath structure changes towards a subgrain structure with a low dislocation density, whcih is in accordance with the state of the thermodynamic equilibrium. This evolution is accompanied by the growth of precipitates from the as received state (M22C6) as well as by the formation of the relatively rapidly coarsening Laves phase, which is connected with a matrix depletion of W and Mo.",

author = "H. Cerjak and P. Hofer and B. Schaffernak and K. Spiradek-Hahn and G{\"u}nter Zeiler",

year = "1998",

language = "Deutsch",

isbn = "3-89336-228-2",

pages = "9",

booktitle = "Materials for Advanced Power Engineering 1998 Cost Proceedings Part I",

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TY - CHAP

T1 - The main parameters influcencing the creep resistance of advanced 9-12% Cr-Steels for power plant applications

AU - Cerjak, H.

AU - Hofer, P.

AU - Schaffernak, B.

AU - Spiradek-Hahn, K.

AU - Zeiler, Günter

PY - 1998

Y1 - 1998

N2 - The extrapolation of long term creep ruptre strengths from short term creep tests is particularly problematic for the group of 9-12% steels group, because their martensitic microstructure shows a low stbility at service conditions. During creep as well as under thermal exposure in the range of about 600°C significant microstructural changes occur and can be observed. The martensitic lath structure changes towards a subgrain structure with a low dislocation density, whcih is in accordance with the state of the thermodynamic equilibrium. This evolution is accompanied by the growth of precipitates from the as received state (M22C6) as well as by the formation of the relatively rapidly coarsening Laves phase, which is connected with a matrix depletion of W and Mo.

AB - The extrapolation of long term creep ruptre strengths from short term creep tests is particularly problematic for the group of 9-12% steels group, because their martensitic microstructure shows a low stbility at service conditions. During creep as well as under thermal exposure in the range of about 600°C significant microstructural changes occur and can be observed. The martensitic lath structure changes towards a subgrain structure with a low dislocation density, whcih is in accordance with the state of the thermodynamic equilibrium. This evolution is accompanied by the growth of precipitates from the as received state (M22C6) as well as by the formation of the relatively rapidly coarsening Laves phase, which is connected with a matrix depletion of W and Mo.

M3 - Buchkapitel

SN - 3-89336-228-2

SP - 9

BT - Materials for Advanced Power Engineering 1998 Cost Proceedings Part I

ER -