August 2020 Volume 2

FORGING RESEARCH

4.3.2 Grain Coarsening Trials ...................................................................................................................................................69 4.3.3 Recrystallization Forging Trials ........................................................................................................................................70 4.4 Cooling Experiments ..................................................................................................................................................................71 4.4.1 Standard Processing Procedure .........................................................................................................................................71 4.4.2 Air Cooling Experiments . ................................................................................................................................................72 4.4.3Water Quenching Experiments ........................................................................................................................................73 4.4.4 Bainitic Cooling Experiments ..........................................................................................................................................73 4.5 Full Forging Trials .......................................................................................................................................................................74 4.5.1 Standard Full Forging Procedure ......................................................................................................................................74 4.5.2 Initial Full Forging Experiments . .....................................................................................................................................74 4.5.3 Submersive Interrupted Quench Trials .............................................................................................................................75 4.5.4 Full Forging Hot Water Quench Trials .............................................................................................................................79 5.0 Results ................................................................................................................................................................................................81 5.1 BAMPRI Laboratory Simulation Trials ......................................................................................................................................81 5.1.1 Results of Initial Convection Furnace Heating Trials .......................................................................................................81 5.1.2 Results of Grain Coarsening Trials ...................................................................................................................................82 5.1.3 Results of Recrystallization Forging Trials ........................................................................................................................86 5.1.4 Results of Cooling Experiments ........................................................................................................................................88 5.1.5 Results of Submersive Interrupted Quench Trials .............................................................................................................91 5.2 MFC Full Forging Trials .............................................................................................................................................................93 5.2.1 Initial Full Forging Trials .................................................................................................................................................93 5.2.2 Results of Full Forging Hot Water Quench Trials ............................................................................................................102 5.3 Results: Advanced Metallographic Analysis ................................................................................................................................108 5.3.1 Final Phase Analysis ..........................................................................................................................................................108 5.3.2 Precipitation Analysis .......................................................................................................................................................122 6.0 Discussion ..........................................................................................................................................................................................138 7.0 Conclusions ........................................................................................................................................................................................161 8.0 Future Work .......................................................................................................................................................................................163 Bibliography..............................................................................................................................................................................................165

FIA MAGAZINE | AUGUST 2020 64