应用马弗炉对灰口铸铁试样进行热循环处理,并通过Gleeble-1500、光学显微镜、电子显微镜和能谱仪等手段重点分析了灰口铸铁拉伸性能、基体组织、化学成分与热历程的相关性.发现铸态试样珠光体片层间距较大,石墨片较厚,且其周围存在铁素体,这是其拉伸性能较差的根本原因.经800℃保温3h控温冷却后,试样组织均匀性显著改善,低温抗拉强度提高约30％.多次热循环处理后,试样各温度下的拉伸性能均有所下降,这与高温氧化、脱碳有关.试样经30次热处理后,碳的质量分数降至1.55％,致使珠光体转变难以完成.同时,在石墨片周围形成硅、锰、铁等氧化物的疏松带,二次渗碳体和晶粒粗化也均是试样抗拉强度下降的重要原因.
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