GH4742合金大锭型均匀化工艺的研究.pdfVIP

固 第1篇变形高温舍垒 GH4742合金大锭型均匀化工艺研究 胥国华01 张北江1秦鹤勇1赵光普1王林涛2赵长虹3 (1．钢铁研究总院高温材料研究所，北京100081；2．宝山钢铁股份有限公司特殊钢分公司 上海200940；3．东北特殊钢集团抚顺特殊钢股份有限公司，辽宁抚顺113001) 摘要本文对GH4742合金∞08mm自耗锭铸态组织和均匀化工艺进行了研究。随着锭型扩大。元素偏析严重， 材料显微组织(尤其是1’相)不均匀。高温扩散退火能够有救地使GH4742台金显微成分均匀，但退火温度和时间 必须严格控制。研究表明：采用两段式均匀化制度可以消除显微偏析和异常组织，提高合金的热加工塑性，为 GH4742大锭型开坯奠定良好的基础。 关键词GH4742合金，大锭型，偏析，均匀化 of of GH4742 Large-scale HomogenizationIngotsSuperalloy XuGuohua01 Zhao Linta02Zhao ZhangBeijian91Qi．Heyon91GuangpulWang Changhon93 MartialsRemch Steel Iron (1．HighTemperature Institute，CISRI，Beijing100081，Chioa；2．SpecialBranch，Baoshan Steel and Steel Fushun Co．，眦，Shahghal200940，China；3．NortheastSpecialCo．。Ltd．，Liaoning113001，China) of AbstractTheas-castmietostruetureand treatmentOildiameter508mm GH4742wereinves— homogenization ingotsuperalloy inthe isincreasedwiththediameter microstrueture areunevelL tigated．Microsegregationingot enlargedt especially1’phase treatmentCallleliminatedendritie the andtimeshouldbecontrolled segregation Homogenization effectively，buttemperature rcsultsshowthat ofll35。Cx48h+1170。G×8his strictly．The homogenizationtreatment suitablefortheingoLMicrosegrega- are of are finnandabnormal eliminatedandhot phase working alloy improved ductility words Key superalloyGH4742，large．scaleingot，segregation，homogenization 1前言