Kennametal Inc.'s board has appointed Lawrence Stranghoener as chairman, succeeding Ronald DeFeo, who is retiring from his role as executive chairman. Stranghoener has been on Kennametal's board since 2003. He is the retired executive vice president and CFO of Mosaic Co., and also held executive positions with Thrivent Financial and Honeywell Inc. DeFeo is giving up the chairmanship in July, but will remain on the board of directors until his retirement in October. "We are grateful to Ron for…