Stainless steel box cracking in transit to Japan

Tom's opening case (recording starts mid-narrative). Used to illustrate delayed hydrogen cracking and TRIP steel transformation: the cracks appeared on the top of the formed box where deformation-induced martensite raised hardness. Magnet test confirmed the transformation gradient.

The cracks weren't showing up until they got to Japan. They'd ship them out of Brooklyn, and by the time they got to Japan they had cracks. So they brought these to me — and some of the cracks actually extended over time, or they did for the first few months after they brought it to me. There are cracks in here; you can look on the inside and see them, see light through there. But I noticed that the cracks were on the top, which was another clue. So it was delayed cracking — hydrogen cracking is called delayed cracking. I noticed they were at the top, and I know that when you take a flat plate of this type of steel and form it, you get the maximum deformation as you roll it up like this, up here.