Abstract：
:The objective of this paper is to develop a nondestructive method for estimating the fracture toughness (K(IC)) of CrMoV steels used as the rotor material of steam turbines in power plants. To achieve this objective, a number of CrMoV steel samples were heat-treated, and the fracture appearance transition temperature (FATT) was determined as a function of aging time. Nonlinear ultrasonics was employed as the theoretical basis to explain the harmonic generation in a damaged material, and the nonlinearity parameter of the second harmonic wave was the experimental measure used to be correlated to the fracture toughness of the rotor steel. The nondestructive procedure for estimating the K(IC) consists of two steps. First, the correlations between the nonlinearity parameter and the FATT are sought. The FATT values are then used to estimate K(IC) using the K(IC) versus excess temperature (i.e., T-FATT) correlation that is available in the literature for CrMoV rotor steel.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Jeong H,Nahm SH,Jhang KY,Nam YHdoi
10.1016/s0041-624x(03)00154-9subject
Has Abstractpub_date
2003-09-01 00:00:00pages
543-9issue
7eissn
0041-624Xissn
1874-9968pii
S0041624X03001549journal_volume
41pub_type
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