Journal Published Online: 26 March 2019
Volume 48, Issue 5

Characterization of Creep Degradation of Modified 9Cr-1Mo Steel Using Magnetic Measurement

CODEN: JTEVAB

Abstract

Microstructure evolution during the creep of a modified 9Cr-1Mo heat-resistant steel was characterized by a nondestructive method of magnetic hysteresis loop (MHL) technique at 893 K (620°C). Two parameters of coercivity and remanence were introduced to evaluate the magnetic properties of interrupted crept specimens. Experimental results suggested that both the parameters were significantly sensitive to the microstructures, such as dislocations, precipitates, and microcracks. During the primary and secondary creep stage, the coercivity and remanence increased with creep time, which was mainly attributed to the increase in pinned dislocations and number density of precipitates. However, because of the coarsening of M23C6 carbides and presence of a demagnetizing field induced by the nonmagnetic precipitates and microcracks, the coercivity and remanence decreased during the tertiary creep stage. It suggested that the MHL technique has great potential to evaluate the microstructure evolution during creep degradation of heat-resistant steels.

Author Information

Zhu, Lin
School of Chemical Engineering, Northwest University, Xi’an, China
Liu, Xinbao
School of Chemical Engineering, Northwest University, Xi’an, China
Fan, Ping
School of Information Science and Technology, Northwest University, Xi’an, China
Yang, Changlin
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, China
Liu, Jianqiu
School of Chemical Engineering, Northwest University, Xi’an, China
Pages: 10
Price: $25.00
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Stock #: JTE20180680
ISSN: 0090-3973
DOI: 10.1520/JTE20180680