Method of detecting the embrittlement of two-phase stainless ste

Details Method of detecting the embrittlement of two-phase stainless ste Method of detecting the embrittlement of two-phase stainless ste

1996-10-04

1998-06-09

Noland, Thomas P.

Measuring and testing

Embrittlement or erosion

G01N 1700, G01N 3320, G01N 300, G01N 340

Patent

active

057619530

ABSTRACT:
The main object of the present invention is to permit the non-destructive examination of the embrittlement of two-phase stainless steel. There remains anxiety about the reliability of methods based on conventional formulae because an actual machine is not examined to confirm its degree of embrittlement, and its Charpy impact absorption energy at room temperature cannot be estimated accurately. The present invention provides a method of detecting the embrittlement of two-phase stainless steel, which comprises measuring the hardness of the ferrite phase and the hardness of austenite phase of two-phase stainless steel along with reading (1) the area ratio of the ferrite phase from microstructure observation, (2) the area ratio of the ferrite phases and the space between the ferrite phases from microstructure observation, or (3) the area ratio of the ferrite phase, the space between the ferrite phases, and the occupying ratio of carbide in the grain boundary length from microstructure observation to estimate the Charpy impact absorption energy at room temperature of the two-phase stainless steel.

REFERENCES:
patent: 4428781 (1984-01-01), Norstrom
patent: 4461168 (1984-07-01), Kobayashi
patent: 4719583 (1988-01-01), Takafuji et al.
Modelling of Microstructural Evolution and Mechanical Properties of Steel Plates Produced by Thermo-Mechanical Control Process, A. Yoshie et al., ISIJ International, vol. 32, No. 3, 1992, pp. 395-404 month not give.

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