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金属学报  2015 

DD9单晶高温合金拉伸性能各向异性

DOI: 10.11900/0412.1961.2015.00369, PP. 1253-1260

Keywords: 单晶高温合金DD9,拉伸性能,各向异性,断口,位错

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Abstract:

采用OM,SEM和TEM研究了[001],[011]和[111]取向第三代单晶高温合金DD9组织,在拉伸试验机上测试了3种取向760和1100℃下的拉伸性能.结果表明,在垂直于晶体生长方向的截面上,[001],[011]和[111]取向DD9合金铸态枝晶形貌、热处理态γ’相形状不同;随着温度的升高,合金的抗拉强度与屈服强度降低,各向异性减弱;除1100℃下[001]取向屈服强度略低于[011]取向,[001]取向DD9合金抗拉强度与屈服强度分别高于[011]和[111]取向合金;[001],[011]和[111]取向DD9合金760℃下拉伸断口呈类解理特征,1100℃下断口为韧窝断裂特征;760℃下DD9拉伸试样在基体通道内含有浓密的位错,[001]取向在γ’相内出现了层错,1100℃下[001]与[111]取向在基体通道内和γ’相内累积了大量浓密的位错网,[011]取向出现了大量的形变孪晶带.

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