Frontiers in Materials Science, Engineering, and Technology: An FMD Symposium in Honor of Sungho Jin: Process-Property-Performance Correlations: Metals, Alloys and Ferroelectrics
Sponsored by: TMS Functional Materials Division, TMS: Biomaterials Committee, TMS: Electronic Packaging and Interconnection Materials Committee, TMS: Nanomaterials Committee, TMS: Thin Films and Interfaces Committee
Program Organizers: Fay Hua, Intel Corporation; Tae-Kyu Lee, Portland State University; Young-Ho Kim, Hanyang University; Roger Narayan, University of North Carolina; Choong-un Kim, University of Texas at Arlington; Nuggehalli Ravindra, New Jersey Institute of Technology

Monday 8:30 AM
February 27, 2017
Room: 33B
Location: San Diego Convention Ctr

Session Chair: Sung Kang, IBM; Nuggehalli Ravindra, New Jersey Institute of Technology

8:30 AM Introductory Comments

8:40 AM  Invited
The Grain Refinement of Martensitic Steel by Thermal Processes: John Morris1; 1University of California Berkeley
    Sungho Jin's first major scientific contribution was his design of a multi-step thermal cycling treatment that produced an ultra-fine effective grain size and exceptional cryogenic toughness in an Fe-12Ni martensitic steel. While the method was spectacularly successful, the actual microstructures refinement mechanisms were unclear. It was not even clear which microstructures feature determined the effective grain size. After many years of fundamental research, the meaning of grain size in martensitic steels is now clear, as are the microstructures mechanisms that are exploited in thermal cycling treatments of the sort Sungho Jin pioneered to refine the grain size of martensitic steels. The present paper will discuss the microstructure of lath martensitic steel, identify the effective grain size, and describe how appropriate thermal treatments exploit the details of the martensitic transformation to refine grain size and produce superior low-temperature properties.