Optimised microstructure for increased creep rupture strength of MarBN steels

被引：14

作者：

Plesiutschnig, E. ^{[1
]}

Beal, C. ^{[1
]}

Paul, S. ^{[2
]}

Zeiler, G. ^{[2
]}

Sommitsch, C. ^{[1
]}

机构：

[1] Graz Univ Technol, Inst Mat Sci & Welding, A-8010 Graz, Austria

[2] Bohler Edelstahl GmbH & Co KG, A-8605 Kapfenberg, Austria

来源：

MATERIALS AT HIGH TEMPERATURES | 2015年 / 32卷 / 03期

关键词：

MarBN steels; Creep; SEM; EBSD; Steam turbine; Hot pipes; LATH MARTENSITE; CRYSTALLOGRAPHY; MORPHOLOGY;

D O I：

10.1179/0960340914Z.00000000073

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The efficiency of modern steam power plants relies heavily on the inlet fluid temperature and pressure. Thus it is necessary to improve the materials of cast, rolled and forged parts such as case, pipes and rotor. Two chemical compositions of 9%Cr creep resistant steels were investigated. Different heat treatments were applied to modify the prior austenite grain size (to diameters of 50, 100, 300 and 700 mu m) and to modify the substructure. The microstructure changes were further investigated by LOM, SEM and EBSD. Then, these different microstructures were exposed to the uniaxial creep rupture test at 650 degrees C and 150 MPa. Comparative results reveal the influence of the modified microstructure on creep rupture time, ductility and fracture.

引用

页码：318 / 322

页数：5

共 21 条

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