GB/T 7964-2020Sintered metal materials( excluding hardmetal )—Tension testing at room temperature (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009.

This Standard replaced GB/T 7964-1987 Sintered Metal Materials (Excluding Hardmetal) -Tension Testing at Room Temperature.

Compared with GB/T 7964-1987, this Standard made the major technical changes as follows besides the editorial modifications:

--- Change "yield point" into "yield strength"; change "yield stress" into "specified plastic elongation strength"; and change "elongation" into "elongation after break" (see Clause 1 of this Edition; Clause 1 of 1987 Edition);

--- Add normative references (see Clause 2 of this Edition);

--- Modify "record the corresponding load, deformation or draw the stress-strain diagram (load-elongation diagram), measure mechanical properties" into "record the corresponding load and deformation by the computer to obtain the load-elongation diagram, and calculate the mechanical properties" (see Clause 3 of this Edition; Clause 2 of 1987 Edition);

--- Modify the expressions and corresponding instructions of the used symbols (see Clause 4 of this Edition; Chapter 1 of 1987 Edition);

--- Modify "performed in accordance with GB/T 7963-1987 Sintered Metal Materials (Excluding Hardmetal) - Tensile Test Pieces" into "sample preparation and requirements shall be performed in accordance with the provisions of GB/T 7963" (see Clause 5 of this Edition; Clause 3 of 1987 Edition);

--- Modify the part of the testing machine into "the testing machine of any system used for tensile testing, the accuracy should be Level-1 or better, and be tested according to GB/T 16825.1" (see 6.1 of this Edition; 4.1 of 1987 Edition);

---Confirm that the accuracy requirement of the extensometer is Level-1 or better (see 6.3 of this Edition; 4.3 of 1987 Edition);

--- Modify the "accuracy 0.02mm" of the size measuring instrument into "accuracy 0.01mm" (see 6.4 of this Edition; 4.4 of 1987 Edition);

--- Modify "measurement accuracy 0.02mm" into "measurement accuracy 0.01mm" (see 7.1.1 of this Edition; 5.1.1 of 1987 Edition);

--- Modify the rate control mode (see 7.2 of this Edition; 5.2 of 1987 Edition); Sintered Metal Materials (Excluding Hardmetal)

1 Scope

This Standard specifies the room temperature tensile test method for sintered metal materials, including principles, symbols and instructions, specimens, test device, test procedures, calculation of test results, numerical rounding-off and test reports.

This Standard is applicable to the determination of the yield strength, specified plastic elongation strength, tensile strength, elongation after break, and reduction of area for machined or non-machined sintered metal materials (excluding hardmetal).

2 Normative References

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.

GB/T 7963 Sintered Metal Materials, Excluding Hardmetals - Tensile Test Pieces

GB/T 16825.1 Verification of Static Uniaxial Testing Machines - Part 1:

Tension/Compression Testing Machines - Verification and Calibration of the Force- Measuring System

3 Principle

Put the specimen in the appropriate position of the fixture; start the testing machine; make the specimen continuously and uniformly bear the tensile stress till break under the specified tensile speed; and record the corresponding load and deformation by the computer to obtain the load-elongation diagram; and calculate the mechanical properties.

5 Specimen

The preparation and requirements of the specimens shall be carried out in accordance with the provisions of GB/T 7963.

6 Test Device

7 Test Procedures

8 Calculation of Test Results