This part specifies a method of tensile testing of metallic materials at temperatures higher than room temperature in terms of definition, symbols and designations, test piece and dimension measurement, apparatus, test conditions, performance determination, determination result rounding off and test report.
This part is applicable to determination of tensile properties of metallic materials at a temperature higher than room temperature.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 228.1-2010 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature(ISO 6892-1: 2009, MOD)
GB/T 16825.1 Verification of Static Uniaxial Testing Machines - Part 1: Tension/compression Testing Machines - Verification and Calibration of the Force-measuring System (GB/T 16825.1-2008, ISO 7500-1: 2004, IDT)
GB/T 12160 Calibration of Extensometers Used in Uniaxial Testing (GB/T 12160-2002, ISO 9513: 1999, IDT)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 228.1-2010 apply with the following exceptions and supplements.
In general, all test piece geometries/dimensions are based on measurements taken at room temperature. The exception may be the extensometer gauge length (see 3.3 and 10.2.2).
Note: The following properties are generally not determined at elevated temperature unless required by relevant specifications or agreement:
——Permanent set strength (Rr);
——percentage permanent elongation;
——percentage permanent extension;
——percentage yield point extension (Ae);
——percentage total extension at maximum force (Agt);
——percentage plastic extension at maximum force (Ag);
——percentage total extension at fracture (At).
3.1
Original gauge length
Lo
Gauge length measured at room temperature before heating of the test piece and before application of force.
3.2
Percentage elongation after fracture
A
Permanent elongation at room temperature of the gauge length after fracture (Lu - Lo), expressed as a percentage of the original gauge length (Lo).
Note: For further details, see GB/T 228.1-2010, 3.4.2.
3.3
Extensometer gauge length
Le
Length within the parallel portion of the test piece used for the measurement of extension by means of an extensometer.
3.4
Extension
Increase in the extensometer gauge length (Le) at a given moment during the test.
3.5
Percentage extension
Extension expressed as a percentage of the extensometer gauge length (Le).
3.6
Percentage reduction of area
