How to perform the temper embrittlement tendency assessment test with stepped cooling
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For the evaluation of temper embrittlement tendency, there are 16 groups each for the weld metal and the heat-affected zone, with 3 specimens in each group. 8 groups with stepped cooling. So for this test, does the length of the test plate have to be 10*16*3=960? What does stepped cooling mean? How is it implemented exactly? For the process, does one just need to decide the length of the test plate, and nothing else needs to be considered?
The machining allowance at the notch of the impact specimen needs to be considered. Moreover, 16 groups of samples may be sufficient or insufficient (the randomness in impact energy values can be quite high). It’s better to prepare as many samples as possible.