Fracture analysis and countermeasures of the grid switch castings Chao Feng, Siyuan Yang, Qiao Li, Mengbao Zhou, Songqi Wu, Jiarui Hu, Yi Xie, Wun Wang, Yi Long and Weike Liu E3S Web Conf., 165 (2020) 06015 Published online: 01 May 2020 DOI: 10.1051/e3sconf/202016506015