Crack testing of powdered metal parts

Ron Rompen

Trusted Information Resource
#1
We currently have a customer failure (cracked parts) and our investigation has concluded that the parts in question were cracked during compacting. The cracking was horizontal and did NOT extend to the surface of the part until undergoing assembly at the customer site.

Our current test method is to take samples during the compacting process, sinter them, and then do microscopic analysis of cross-sections. As you can imagine, this is a slow process (3 hours is a QUICK turnaround for sintering and analysis) and has an inherent potential for error.

Does anyone know of an alternative method which could be used to examine compacted powdered metal parts for cracking? I have already reviewed ultrasonic and eddy current testing, and found that neither of them are suitable at this stage.

Thanks in advance.
 
Elsmar Forum Sponsor
#2
Could you ring the parts like a bell? I did this for some carbon ceramics composites and had a frequency response which showed cracks and weighing to show voiding. Ring each part, microscopy on 1 per batch. Of course I am naive in this application.
 

JeantheBigone

Quite Involved in Discussions
#4
Acoustic spectral analysis is used for 100 % in-line inspection on P/M parts by some manufacturers. I had to dig into this a while back when we had issues with P/M parts supplied by a vendor who did NOT have this capability and the parts had voids the size of peppercorns. The vendor blamed heat treat and shot peen for the defects. :cool:

So in essence, yes, it is like tapping it and "listening" for the characteristic overtones. The disadvantage is that you can only interpret the response if you have done a correlation between the output spectrum and the defects.

I'll see what documentation if any I have at work this coming week.
 
Thread starter Similar threads Forum Replies Date
A Crack Testing of Raw Materials - Steel Inspection, Prints (Drawings), Testing, Sampling and Related Topics 11
C Gage R&R not passing for Check Valves Crack Pressure - No Reproducibility Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
Jim Wynne NASA's competence in question again - Crack found in external fuel tank foam Coffee Break and Water Cooler Discussions 6
K When is Bioburden Testing Required? Other Medical Device Related Standards 3
K IEC 62304 - Testing Independance IEC 62304 - Medical Device Software Life Cycle Processes 5
A ANSI/AAMI versions of 60601-1-2 and related testing requirements Other Medical Device Related Standards 0
C Surgical mask stability testing (CE mark) EU Medical Device Regulations 1
Beliz Biocompatibility Testing for Laser Epilation Device EU Medical Device Regulations 2
C One Time Service Supplier - Temperature and Humidity Testing Service ISO 13485:2016 - Medical Device Quality Management Systems 5
D IEC 60601-1 - Service life testing IEC 60601 - Medical Electrical Equipment Safety Standards Series 8
P Flammability Testing of Aircraft Interior Materials Federal Aviation Administration (FAA) Standards and Requirements 0
N Usability testing required for FDA IDE (investigational device exemption)? Human Factors and Ergonomics in Engineering 3
E ASTM F2118 - Fatigue testing of bone cement - Changes between the 2003 and the 2014? Other Medical Device Related Standards 1
K Biocompatibility Testing - Multile products of different sizes and shapes US Food and Drug Administration (FDA) 2
S Requirement to Conduct New Shelf-life Testing? (re-do testing for design change) EU Medical Device Regulations 3
JoCam Mobile Patient Hoists and Electrical Testing Other Medical Device Related Standards 0
T Interlaboratory comparison or proficiency testing in destructive testing of welded joints ISO 17025 related Discussions 2
B ASTM E18-2020 - Rockwell testing standard changes? General Measurement Device and Calibration Topics 2
U Medical Device Design finalization testing ISO 13485:2016 - Medical Device Quality Management Systems 2
Jane's Like-for-like critical raw material change qualification - type of testing/ number of lots required ISO 13485:2016 - Medical Device Quality Management Systems 4
J Conflict of Interest Registrar/Notified Body/Testing House Quality Manager and Management Related Issues 4
M Inter-operator Variability Testing - Requirements for EU Medical Device Regulations 5
S High voltage testing - ISO 17025 - 7.2.2 Validation of methods and 7.3 Sampling ISO 17025 related Discussions 3
M Production approval testing - Alternative ideas for Validation Reliability Analysis - Predictions, Testing and Standards 4
JoCam MDL in Canada without Canadian Electrical Testing Canada Medical Device Regulations 0
T HF testing / Summative evaluation for MDDS class I necessary? Human Factors and Ergonomics in Engineering 2
Kuldeep Singh Diagnostic X-ray devices - Applicability of Biocompatibility Testing per ISO 10993-1 Manufacturing and Related Processes 7
K Proper document of SMPS used in infant warmer for IEC 60601-1 testing IEC 60601 - Medical Electrical Equipment Safety Standards Series 1
K Sequence of testing in IEC 60601-1 IEC 60601 - Medical Electrical Equipment Safety Standards Series 2
M Workplace Drug Testing in 2020 Misc. Quality Assurance and Business Systems Related Topics 9
W ASTM F1929 dye penetration test - Validation for in-house testing ISO 13485:2016 - Medical Device Quality Management Systems 13
J FDA wants electrical safety testing on battery powered medical device US Food and Drug Administration (FDA) 11
S Internal calibrations - Part of an ISO 17025 accredited testing laboratory (Automotive) ISO 17025 related Discussions 3
T Qualification testing of Lead acid batteries Reliability Analysis - Predictions, Testing and Standards 0
D Sterility and BioBurden Testing for Plastics ISO 13485:2016 - Medical Device Quality Management Systems 5
DitchDigger IEC 60601-1 subclause 5.1 - Adequate evaluation in lieu of testing IEC 60601 - Medical Electrical Equipment Safety Standards Series 2
E Correct way to certify hydrostatic testing when it is not 100% (and Sample Size) Various Other Specifications, Standards, and related Requirements 6
MrTetris Are GLP required for testing cytotoxicity and soil remaining after sterilization of MD? Other Medical Device Related Standards 8
D Design Verification - Is testing required? Design and Development of Products and Processes 5
M Specific Absorption Rate (SAR) Testing - What Standard to Use? Other ISO and International Standards and European Regulations 1
N IATF 16949:2016 7.1.5.3.2 External Laboratory - How to approve the Testing Laboratory without accreditation scope IATF 16949 - Automotive Quality Systems Standard 2
T Spirometer - Pulmonary Function Testing - ATS/ERS:2005 EU Medical Device Regulations 5
M 510(k) 10993 Biocompability Testing Other US Medical Device Regulations 15
C Sterility and Bioburden Testing - LAL passed under 0.5EU/mL Pharmaceuticals (21 CFR Part 210, 21 CFR Part 211 and related Regulations) 3
A ISO 17025 Requirement 6.2 - Department Manager Testing Qualifications ISO 17025 related Discussions 1
P IEC 62304 - evaluation of integration and system testing IEC 62304 - Medical Device Software Life Cycle Processes 4
H EO Sterilization Validation - Sterility Testing and Load Configuration Other Medical Device Related Standards 1
M What to do in SOP Phase of Head unit testing? IATF 16949 - Automotive Quality Systems Standard 0
W SOP examples wanted - Soil, Concrete and Asphalt testing ISO 17025 related Discussions 3
M Informational TGA Consultation: Review of the regulation of certain self-testing IVDs in Australia Medical Device and FDA Regulations and Standards News 0

Similar threads

Top Bottom