Validation of cryogenically treated articles
Embodiments validate cryogenic processing of metal-matrix validation articles according to destructive and/or non-destructive testing of witness articles. For example, validation can certify that the validation article has undergone a particular cryogenic treatment protocol, resulting in validated and/or certified enhancements in wear characteristics, resistance to corrosion, increases in electrochemical bonding of surface treatments, increases in theoretical useable lifespan, etc. According to some embodiments, processing results are validated by generating witness results from destructive and/or non-destructive testing of the witness articles subsequent to deep-cryogenic treatment. The processing (e.g., including witness results and/or analysis thereof) may then be entered into a computer-controlled, parametric analysis system that generates absolute and comparative validation and/or certification of the validation articles.
1. A method for validation of cryogenically treated articles, the method comprising:
performing destructive testing on a witness article according to a predetermined test protocol to generate witness results subsequent to cryogenic treatment concurrently of the witness article and a treatment article according to a treatment protocol, the witness results comprising a measure of a first metallurgic characteristic of the witness article that is predetermined to undergo, during cryogenic treatment according to the treatment protocol, a first associated enhancement that can be measured only by destructive testing, the witness article produced from a same metal-matrix material as that of the treatment article such that both comprise the metallurgic characteristic, such that the witness results indicate whether the first associated enhancement in the metallurgic characteristic is present in the witness article subsequent to the cryogenic treatment;
performing non-destructive testing on the treatment article according to the predetermined test protocol subsequent to the cryogenic treatment, the witness results further comprising a measure of a second metallurgic characteristic of the treatment article that is predetermined to undergo a second associated enhancement during the cryogenic treatment, such that the witness results indicate whether the second associated enhancement in the metallurgic characteristic is present in the treatment article subsequent to the cryogenic treatment; and
validating the cryogenic treatment of the treatment article only when the witness results indicate that the first associated enhancement is present in the witness article and the second associated enhancement is present in the treatment article.
2. The method of claim 1 , wherein the cryogenic treatment of the witness article and treatment article according to the treatment protocol comprises:
ramping down a temperature of the treatment article from an ambient temperature to a low temperature according to a ramp down profile dictated by the treatment protocol;
cold soaking the treatment article for a duration dictated by the treatment protocol; and
ramping up the temperature of the treatment article from the low temperature to the ambient temperature to a according to a ramp up profile dictated by the treatment protocol.
3. The method of claim 2 , the cryogenic treatment of the witness article and treatment article according to the treatment protocol comprises further comprises:
tempering the treatment article according to one or more tempering profiles dictated by the treatment protocol.