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Iron-carbon phase                                 1         2         3
                                                                          3

               diagram                                                                                This austenite



                                                                                                      persists to 1394




                 Iron-carbon                                                                          C, at which

                                                                                                      temperature, the
         phase diagram                                                                                FCC austenite




                                                                                                      reverts back to a



                                                                                                      BCC phase

                                                                                                      known as 
                                                                                                                                -


                                                                                                      ferrite, which


                                                                                                      finally melts at


                                                                                                      1538 C.






               Source: Jr., W. D. C. & Rethwisch, D. G. 2015
                                                                                                                                        280



                                                    Politeknik Ibrahim Sultan
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