The current A/SP Delayed Cracking test (attached) is too aggressive (0.1 N, pH=1) than reality. Curious if there is any simple mechanical test can be used
I don't know any hydrogen induced cracking test for Automotive steels. I'm studying RSW and Laser welding hydrogen embrittlement. You're right, We need a hydrogen induced cracking test.
It is necessary to separate the tests for hydrogen cracking for materials operating in an aggressive environment without protection and all others.
In particular, automotive steels are generally protected against corrosion by various films and paints. They do not have direct contact with the aggressive environment during operation. If you want corrosion-resistant steel - take a stainless. You also can try and titanium - it is the solution of all problems, but very expensive.
You need high-strength steel, it is sensitive to hydrogen. The only problem is how it will be inside. Primary saturation during its production is possible. In this case, a volume structure is formed and the effect of hydrogen is very strong.
During operation, hydrogen is saturated from the environment. But it happens through the surface. Much depends on the state of this surface. In this sense, the use of thin plates in your tests causes many problems.
The method of surface treatment of the plates will greatly influence on the results of the test. In fact, you will test not a metal, but a concrete plate. In some cases this is useful, but it may be that minor surface treatment will completely change the test results.
Hi Vignesh,
my colleagues have published several papers over the last years, describing the application of various test methods on 22MnB5. You might want to take a look:
Article Consideration of hydrogen transport in press-hardened 22MnB5
https://link.springer.com/article/10.1007%2Fs40194-014-0119-xhttps://link.springer.com/article/10.1007%2Fs40194-016-0364-2
Hi Vignesh,
There is currently no standard tests for HE assessment of automotive AHSS, though we were informed that automotive companies are adopting the test method you have cited. Previous studies have used SSRT; I personally have employed LIST on MS-AHSS. But again the results of these tests are only useful to a certain extent because the tests performed does not conform to a specific standard.
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