Speaker: Professor Sindo Kou
Topic: Grain Refining and Cracking during Solidification
Time: Jan. 13, 2025 11:00-12:00
Location: Room 228, College of Engineering Building
Abstract:
Grain refining is of practical interest in casting, welding and additive manufacturing. Despite extensive studies for over 50 years, it is still not very clear why grain refining (i.e., decreasing the grain size) can effectively decrease the susceptibility to cracking during solidification. It is even more puzzling why over grain refining (i.e., making grains too small in size) can reverse the trend and significantly increase the cracking susceptibility. To help understand why, the present study included the continuity of the interdendritic liquid and solute poisoning into consideration. The present study also attempted to estimate how much the cracking susceptibility can be decreased by grain refining. To do this, a simple index for the cracking susceptibility was modified to include the extent of grain refining. The validity of the estimation was checked against cracking susceptibility tests in casting and welding.
About the Speaker:
Service Unit: Department of Materials Science and Engineering, University of Wisconsin, Madison
Title: Professor (Emeritus since Summer 2024)
Education and Research Experience:
•BS in Chemical Engineering, National Taiwan University, 1971
•PhD in Materials Science and Engineering, Massachusetts Institute of Technology, 1978
•University of Wisconsin: Professor (1985-2024); Department Chair (2000-2004)
•Books: Welding Metallurgy (cited 6,000 times), 3rd edition (2021), John Wiley;
Transport Phenomena and Materials Processing, John Wiley, 1996
•Fellows: American Welding Society; ASM International
•American Welding Society (AWS): Comfort Adams Lecture (2012); James Lincoln Gold Medal (2016); William Irrgang Memorial Award (2018); 15 best paper awards
•International Institute of Welding (IIW): Yoshiaki Arata Award (2017)
•The Minerals, Metals & Materials Society (TMS): Bruce Chalmers Award (2013); Magnesium Technology Best Paper Award (2017)
•Iron and Steel Society of AIME: John Chipman Award (1980)
•University of Wisconsin: Chancellor’s Award for Distinguished Teaching (1999)