一、前言近代孕育理论的发展科生产实践证明,有效的孕育处理,可以减少或消除铸态碳化物,提高铸态铁素体量,改善球化石墨形态,延缓球化、孕育衰退。这些都有利于改善材料机械性能,特别是塑性、韧性的提高。因此,国外在生产高韧性球铁(不论是铸态还是经热处理后)时,特别注意孕育处理 First, the foreword The development of modern birth theory Section Production Practice has proved that effective inoculation can reduce or eliminate as-cast carbides, increase the amount of as-cast ferrite, improve the morphology of nodular graphite, delaying nodularity, and causing recession. These are conducive to improving the mechanical properties of materials, especially plastic, toughness. Therefore, foreign countries in the production of ductile iron ductile (whether cast or after heat treatment), with special attention to pregnancy treatment