National foreword

This Published Document is the UK implementation of ISO/TS 23867:2026.

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This Published Document was published under the authority of the Standards Policy and Strategy Committee on 30 September 2026.

Foreword

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This document was prepared by Technical Committee ISO/TC 119, Powder Metallurgy, Subcommittee SC 4, Sampling and testing methods for hardmetals.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

Ultrasonic testing of hardmetals is a method used for judging the nature of internal defects. It is based on the reflection characteristics of similar waveforms by comparison with the reflection waveforms of standard test blocks with internal defects. It describes how to use high-frequency sound waves to detect micron-sized defects such as carbon defect, eta-phase, tungsten carbide (WC) aggregates, under-sintered area, cobalt pool, and other structural defects. The equivalent size of hole was determined by distance amplitude defect (DAC), and the indicating length of crack was determined by judging the boundary of defect.

This document covers requirements for personnel qualification, surface requirements of the tested products, environment and coupling agent during ultrasonic testing of hardmetals. This document also covers the requirements for ultrasonic testing equipment performance, materials of test block, tolerance of internal flat bottom hole, sensitivity design and defect identification.

1 Scope

This document specifies an A-type ultrasonic pulse contact method applying the ultrasonic longitudinal wave technique to hardmetals.

This document is applicable to the ultrasonic inspection for a hardmetal rod that has a circular end face with a diameter not less than 6,0 mm and a rod length of 40,0 mm to 380,0 mm, or a hardmetal product that has a non-circular testing area not smaller than the coverage area of the probe (not less than 12,0 mm in diameter) and a height of 10,0 mm to 380,0 mm.

Within the detection range specified in this document, the sound transmission energy is expressed by the probe driving voltage, and the range is 100,0 V to 200,0 V.

2 Normative references

3 Terms and definitions

4 Ultrasonic test block

4.1 Flat-bottom hole test block

4.2 Reference block

5 Equipment and specification

5.1 Type of equipment

5.2 Probe

6 Testing methods

6.1 Testing requirement

6.2 Detection sensitivity

6.3 Detection position

6.4 Probe scanning form

6.5 Probe scanning speed

6.6 Evaluation of test results

7 Defect qualification

7.1 Defect characterization

7.2 Defect equivalent determination

8 Practical application

8.1 Using flat-bottom hole test block to adjust initial sensitivity

8.2 Practical application of defect equivalent size determination

8.3 Practical application of crack defect length measurement

8.4 Calculation of defect area

8.5 Practical application

Bibliography