GB825955A - Method of and means for carrying out nondestructive hardness tests - Google Patents

Method of and means for carrying out nondestructive hardness tests

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Publication number
GB825955A
GB825955A GB26490/56A GB2649056A GB825955A GB 825955 A GB825955 A GB 825955A GB 26490/56 A GB26490/56 A GB 26490/56A GB 2649056 A GB2649056 A GB 2649056A GB 825955 A GB825955 A GB 825955A
Authority
GB
United Kingdom
Prior art keywords
remanence
sample
schafer
saturation
hardness
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.)
Expired
Application number
GB26490/56A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB825955A publication Critical patent/GB825955A/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/80—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating mechanical hardness, e.g. by investigating saturation or remanence of ferromagnetic material

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

825,955. Electric tests. SCHAFER, G., and SCHAFER, O., [trading as KUGELFISCHER, G. SCHAFER, & CO.]. Aug. 30, 1956 [Sept. 1, 1955], No. 26490/56. Class 37. To determine the hardness of a steel both its remanence and saturation are compared with a sample. The Specification explains that the remanence of a sample indicates the quantity of martensite present and thus the hardness but that the presence of residual austenite reduces the saturation and thus the remanence and falsifies the hardness value obtained. As shown, a U - shaped soft iron core 1 having a central limb 7 is provided with windings 5, 6 on its outer limbs which are energized with a pulsating direct voltage, for example a half-wave rectified A.C. One of air gaps 3, 4 contains the sample under test and the other the reference. The flux on the central limb is an indication of the difference of the remanence of reference and sample when the magnetizing field is a minimum and the difference of the saturation when the field is a maximum.
GB26490/56A 1955-09-01 1956-08-30 Method of and means for carrying out nondestructive hardness tests Expired GB825955A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE825955X 1955-09-01

Publications (1)

Publication Number Publication Date
GB825955A true GB825955A (en) 1959-12-23

Family

ID=6747662

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26490/56A Expired GB825955A (en) 1955-09-01 1956-08-30 Method of and means for carrying out nondestructive hardness tests

Country Status (1)

Country Link
GB (1) GB825955A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1180550B (en) * 1961-11-11 1964-10-29 Claus Colani Method for examining a relatively homogeneous medium for areas of different electrical conductivity and device for carrying out the method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1180550B (en) * 1961-11-11 1964-10-29 Claus Colani Method for examining a relatively homogeneous medium for areas of different electrical conductivity and device for carrying out the method

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