Microstructure Evolution in a 9%Cr Heat Resistant Steel during Creep Tests

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Dynamic structural changes during creep tests for about 103 hours at 600 and 650oC were investigated in a P92-type 9%Cr martensitic heat resistant steel. The structural changes are characterised by the development of relatively large equiaxed subgrains with relatively low dislocation densities in place of initial martensite laths. The coarsening of substructure was accompanied by a growth of second phase precipitates. The final grain/subgrain sizes and dislocation densities evolved after the creep tests were in rough correlation with applied stresses, i.e. larger (sub)grains developed under lower stresses. The structural mechanism responsible for microstructure evolution was considered as a kind of continuous dynamic recrystallization.

Info:

Periodical:

Materials Science Forum (Volumes 638-642)

Main Theme:

Edited by:

T. Chandra, N. Wanderka, W. Reimers , M. Ionescu

Pages:

2315-2320

DOI:

10.4028/www.scientific.net/MSF.638-642.2315

Citation:

V. Skorobogatykh et al., "Microstructure Evolution in a 9%Cr Heat Resistant Steel during Creep Tests", Materials Science Forum, Vols. 638-642, pp. 2315-2320, 2010

Online since:

January 2010

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$35.00

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