I am trying to set a PQR for CD4MCU duplex stainless steel casting. After welding, the ASTM standard was followed for PHWT which is, stabilising at 2050F for 1in/hr and 2h min and then furnace cooling to 1900F, stabilising at 1900F and quenching in agitated water. I came up with an average hardness of 237BHN. When subjected to a Guided Bend Test the material failed terribly and fractured without undergoing any bending.
I would really appreciate if some one could throw some light on where I am going wrong.