ASTM A1038-2010 Standard Practice for Portable Hardness Testing by the Ultrasonic Contact Impedance Method《用超声波接触阻抗法进行便携式硬度检验的标准实施规程》.pdf
《ASTM A1038-2010 Standard Practice for Portable Hardness Testing by the Ultrasonic Contact Impedance Method《用超声波接触阻抗法进行便携式硬度检验的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM A1038-2010 Standard Practice for Portable Hardness Testing by the Ultrasonic Contact Impedance Method《用超声波接触阻抗法进行便携式硬度检验的标准实施规程》.pdf(7页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A1038 10Standard Practice forPortable Hardness Testing by the Ultrasonic ContactImpedance Method1This standard is issued under the fixed designation A1038; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This practice covers the determination of comparativehardness values by applying the Ultrasonic Contact ImpedanceMethod
3、 (UCI Method).1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to
4、establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsE10 Test Method for Brinell Hardness of Metallic MaterialsE18
5、 Test Methods for Rockwell Hardness of Metallic Ma-terialsE92 Test Method for Vickers Hardness of Metallic Materi-alsE140 Hardness Conversion Tables for Metals RelationshipAmong Brinell Hardness, Vickers Hardness, RockwellHardness, Superficial Hardness, Knoop Hardness, andScleroscope HardnessE177 Pr
6、actice for Use of the Terms Precision and Bias inASTM Test MethodsE384 Test Method for Knoop and Vickers Hardness ofMaterialsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 Definitions:3.1.1 UCI methodUltrasonic Contact Impedance, a h
7、ard-ness testing method developed by Dr. Claus Kleesattel in 1961based on the measurement of the frequency shift of a resonat-ing rod caused by the essentially elastic nature of the finite areaof contact between the indenter and the test piece during thepenetration.3.1.2 UCI hardness testa hardness
8、testing practice using acalibrated instrument by pressing a resonating rod with adefined indenter, for example, a Vickers diamond, with a fixedforce against the surface of the part to be tested.3.1.3 calibrationdetermination of the specific values ofthe significant operating parameters of the UCI in
9、strument bycomparison with values indicated by a standardized workbenchhardness tester or by a set of certified reference test pieces.3.1.4 verificationchecking or testing the UCI instrumentto ensure conformance with this practice.3.1.5 surface finishall references to surface finish in thispractice
10、are defined as surface roughness (that is, Ra = averageroughness value).4. Significance and Use4.1 The hardness of a material is a defined quantity havingmany scales and being dependent on the way the test isperformed. In order to avoid the creation of a new practiceinvolving a new hardness scale, t
11、he UCI method converts intocommon hardness values, for example, HV, HRC, etc.4.2 The UCI hardness test is a superficial determination,only measuring the hardness condition of the surface con-tacted. The results generated at a specific location do notrepresent the part at any other surface location a
12、nd yield noinformation about the material at subsurface locations.1This practice is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved May 15, 2010. Pub
13、lished June 2010. Originallyapproved in 2005. Last previous edition approved in 2008 as A1038 08. DOI:10.1520/A1038-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer
14、to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.3 The UCI hardness test may be used on large or smallcompon
15、ents at various locations. It can be used to makehardness measurements on positions difficult to access, such astooth flanks or roots of gears.A. GENERAL DESCRIPTION OF INSTRUMENTSAND TEST PROCEDURE FOR UCI HARDNESSTESTING5. Apparatus5.1 Instruments used for UCI hardness testing generallyconsist of
16、(1) a probe containing a rod with a defined indenter,for example, a Vickers diamond, attached to the contacting endper Test Method E92 and Test Method E384, (2) vibrationgenerating means, (3) vibration detecting means, (4) electronicmeans for the numerical evaluation, and (5) a digital display,indic
17、ating the measured hardness number.5.2 UCI ProbesThere are different probes available forUCI hardness testing. They typically cover static loads rangingfrom1Nto98N.Seealso Appendix X1. They come also indifferent sizes with longer and shorter sensor rods for specialsapplications. And they are develop
18、ed in two versions, that is,manually operated or equipped with a servo-motor for auto-matic testing.5.3 Summary of PracticeIn conventional workbenchhardness testing like Brinell or Vickers testing according toTest Methods E10, E92, and E384, the hardness value isdetermined optically by the size of t
19、he indentation in thematerial generated by a certain test load, after the indenter hasbeen removed. In the mobile hardness test under applied loadaccording to the UCI method, however, the size of theproduced indents are not determined optically. Instead thecontact area is derived from the electronic
20、ally measured shiftof an ultrasonic resonance frequency. To carry out the UCI test,a probe containing the rod with the indenter is excited into alongitudinal ultrasonic oscillation of about 70 kHz by piezo-electric ceramicsthe so-called zero frequency, which occurswhen the indenter is vibrating in a
21、ir.5.3.1 A spring inside the probe applies the specified testload, the vibrating tip penetrates into the material creating anelastic contact, which results in a positive frequency shift of theresonating rod. This shift is related to the size of the indent area(contact area of the indenter with the m
22、aterial). The size, inturn, is a measure for the hardness of the test material at a givenmodulus of elasticity, for example, HV(UCI) according to Eq1.5.3.2 Therefore, the frequency shift is relatively small forhard materials, because the indenter penetrates not very deepinto the test material leavin
23、g only a small indent.5.3.3 The frequency shift becomes larger if the indenterpenetrates deeper into the material, indicating medium hard-ness, in accordance with the larger test indentations. Analo-gously, the frequency shift becomes largest when soft materialsare tested (see Fig. 2).5.3.4 The inst
24、rument constantly monitors the resonancefrequency, calculates the frequency shift when the specifiedtest load has been reached either after the internal switch hastriggered the corresponding measurement frequency in the caseof handheld probes or after a specific dwell time has beenelapsed in the cas
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