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金属学报  2015 

高温合金铸锭均匀化程度对开坯热变形的再结晶影响

DOI: 10.11900/0412.1961.2015.00419, PP. 1207-1218

Keywords: 高温合金,均匀化,开坯,枝晶

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Abstract:

利用OM,SEM和裂纹扩展速率测试等手段分析了GH4740H,GH4738,GH3625和690合金不同均匀化程度下的组织特征以及这些组织状态的热变形行为,系统研究了合金均匀化工艺因素与再结晶的关联规律.研究结果表明,合金均匀化需要兼顾枝晶偏析消除带来的热塑性改善以及晶粒长大和氧化加剧所导致的后续热变形时的塑性下降;合金未完全均匀化留下的残留枝晶间区域提供了再结晶形核位置,提高再结晶形核率.在相同热变形条件下,有残留枝晶组织的试样再结晶程度明显高于完全均匀化、无枝晶组织的试样.为此提出基于部分均匀化制度的高温合金均匀化开坯控制方法具有合理性.

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