IGO
IGO
(OP)
Is there a standard which describes how Intergranula Oxidation has to be measured, how the sample has to be prepared, how the reporting (max. or average of x readings etc.,) has to be done.
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RE: IGO
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FAQ731-376: Eng-Tips.com Forum Policies
RE: IGO
Within my own shop I will look at a sample in the unetched condition at 500X magnification, and measure the deepest penetration observed.
RE: IGO
We inspect parts in the polished, unetched condition with an inverted metallograph, usually at 1000X. We measure the deepest penetration. Our limit is 15 micrometers maximum, which isn't very large at 500X.
RE: IGO
Thanks for the response.
We do measurement as per Dbooker630. i.e. 500x un etched condition.
However, the issue came up when HT shop did not concur with lab's finding. HT shop was not accepting that reporting of max. length is the right method. So, I wanted to check on standard's recommendation.
RE: IGO
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: IGO
Intergranular oxidation (IGO), applicable to unground surface. Determined by metallographic inspection of unetched coupon, if used. Limits in micrometers shall be
based on case depth as given.
The table then shows the requirements for class ML, MQ, & ME. The use of the word limits tell you that it is a maximum allowable dimension.
My company specifies that it is the average of the deepest
IGO over a minimum of 5 randomly selected areas.