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  1. RGA1200

    Heat treatment has weakened my crankcase?

    Thank you all for your contributions. I based the second treatment on a quote of Aerospace Material Specification AMS2771 stating solution heat treating at a temp of 540C for six hours before quenching in hot water. After quenching age at 230C for 6-12 hours. I performed only the latter part (a...
  2. RGA1200

    Heat treatment has weakened my crankcase?

    Hi All, I have a sand cast aluminium motorcycle crankcase (believed to be A356 T6) which had been 'ventilated' by an exploding component. I had the case welded and then found it had warped by 2-3mm and upset the alignment of bearing bores at the split line. Through various channels including...

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