JPS5629158A - Measuring method of column-shape crystal rate of cast billet by means of ultrasonic wave - Google Patents

Measuring method of column-shape crystal rate of cast billet by means of ultrasonic wave

Info

Publication number
JPS5629158A
JPS5629158A JP10476179A JP10476179A JPS5629158A JP S5629158 A JPS5629158 A JP S5629158A JP 10476179 A JP10476179 A JP 10476179A JP 10476179 A JP10476179 A JP 10476179A JP S5629158 A JPS5629158 A JP S5629158A
Authority
JP
Japan
Prior art keywords
ultrasonic wave
column
cast billet
shape crystal
crystal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10476179A
Other languages
Japanese (ja)
Inventor
Kiyoshi Matsui
Toru Sato
Takeshi Katayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP10476179A priority Critical patent/JPS5629158A/en
Publication of JPS5629158A publication Critical patent/JPS5629158A/en
Pending legal-status Critical Current

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  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

PURPOSE: To perform the measurement in a short time continuously and nondestructively, by comparing the attenuation constant of ultrasonic wave measured through propagation toward the column-shape crystal progress direction of cast billet with that of known cast iron piece.
CONSTITUTION: When the oscillation signal is applied to the transmission and reception element 6 from the oscillator 7, ultrasonic longitudinal wave is produced and propagates as the arrow, and the ultrasonic wave reflected at the bottom of the cast billet 1 is received at the element 6, and the ultrasonic wave reflected at the bottom is attenuated while repeating the multiple reflection. Among these, the 1st and 2nd bottom reflection waves B1, B2 and the thickness of cast billet D toward ultrasonic wave propagation direction measured by a thickness gauge, are input to the microcomputer 10, and by the column-shape crystal premeasured and the attenuation constants α1, α2 at equal crystal axes, the column-shape crystal rate k is obtained with equation (I). Further, the size of crystal, and variance of segregated impurity are considered, then the average value for a plurality of points is used. Thus, the measurement can continuously and nondestructively be made in a short time.
COPYRIGHT: (C)1981,JPO&Japio
JP10476179A 1979-08-17 1979-08-17 Measuring method of column-shape crystal rate of cast billet by means of ultrasonic wave Pending JPS5629158A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10476179A JPS5629158A (en) 1979-08-17 1979-08-17 Measuring method of column-shape crystal rate of cast billet by means of ultrasonic wave

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10476179A JPS5629158A (en) 1979-08-17 1979-08-17 Measuring method of column-shape crystal rate of cast billet by means of ultrasonic wave

Publications (1)

Publication Number Publication Date
JPS5629158A true JPS5629158A (en) 1981-03-23

Family

ID=14389462

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10476179A Pending JPS5629158A (en) 1979-08-17 1979-08-17 Measuring method of column-shape crystal rate of cast billet by means of ultrasonic wave

Country Status (1)

Country Link
JP (1) JPS5629158A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01163653A (en) * 1987-12-21 1989-06-27 Babcock Hitachi Kk Electromagnetic and ultrasonic testing method
KR101008028B1 (en) 2004-03-11 2011-01-13 니뽄스틸코포레이션 Method and apparatus for measuring crystal grain size distribution

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01163653A (en) * 1987-12-21 1989-06-27 Babcock Hitachi Kk Electromagnetic and ultrasonic testing method
KR101008028B1 (en) 2004-03-11 2011-01-13 니뽄스틸코포레이션 Method and apparatus for measuring crystal grain size distribution

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