Research Progress of the Effects of Trace S Element on the Microstructure of Cast Nickel-base SuperalloysChenguang Liu, Huan Xu, Hui Zhang, Peiyuan Liu, Gong Yang, Lili Cui and Haiwen WangE3S Web Conf., 299 (2021) 02004DOI: https://doi.org/10.1051/e3sconf/202129902004