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扭轉(zhuǎn)預(yù)變形對(duì)定向凝固DZ4合金低周疲勞壽命的影響
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Influence of Torsional Pre-deformation on the Low Cycle Fatigue Life of Directionally Solidified Superalloy DZ4
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    摘要:

    對(duì)定向凝固DZ4合金進(jìn)行扭轉(zhuǎn)預(yù)變形和熱處理后的高溫低周疲勞壽命與斷裂行為進(jìn)行測(cè)試與研究，分析不同的扭轉(zhuǎn)變形程度、變形速率等對(duì)低周疲勞壽命和再結(jié)晶的影響，研究沿晶特征區(qū)的形成機(jī)制。結(jié)果表明，定向凝固DZ4合金在扭轉(zhuǎn)預(yù)變形和熱處理后其低周疲勞壽命急劇下降，分析發(fā)現(xiàn)與塑性變形區(qū)產(chǎn)生的再結(jié)晶組織有關(guān)。再結(jié)晶區(qū)與基體變形不協(xié)調(diào)導(dǎo)致在再結(jié)晶與基體界面處出現(xiàn)損傷和裂紋，裂紋沿再結(jié)晶晶界擴(kuò)展形成沿晶特征區(qū)，使高溫低周疲勞壽命下降，且疲勞壽命隨著再結(jié)晶深度的增大而急劇降低。扭轉(zhuǎn)預(yù)變形程度較小時(shí)，低周疲勞斷口上的沿晶特征區(qū)的深度與斷面沿再結(jié)晶區(qū)擴(kuò)展的深度一致；扭轉(zhuǎn)預(yù)變形程度較大時(shí)，沿晶特征區(qū)的深度相對(duì)較小。另外，應(yīng)變速率增大，加劇了不協(xié)調(diào)變形，再結(jié)晶具有局部化傾向，且再結(jié)晶程度增加，使高溫低周疲勞壽命下降更嚴(yán)重。

    Abstract:

    The low cycle fatigue (LCF) life and fracture behavior of directionally solidified superalloy DZ4 after torsional pre-deformation and heat treatment was tested and studied. The influence of different pre-deformation extents and rates on LCF life and recrystallization was analyzed. The formation mechanism of intergranular area was investigated. The results show that LCF life of directionally solidified superalloy DZ4 decreases rapidly after torsional pre-deformation and heat treatment, which is related to recrystallization texture in plastically deforming area. Cracks and damages are found on the interface of the recrystallization and the matrix caused by their inharmonious deformation, and the cracks propagate along the recrystallization boundary to form intergranular area, resulting in the decrease of LCF life. Meanwhile the life is decreased sharply with the increase of the recrystallization depth. The depth of intergranular area is in accord with the recrystallization depth when the pre-deformation is small; while when the pre-deformation is larger, the depth of intergranular area is relatively smaller. Besides, the increase of strain rate aggravates inharmonious deformation, and makes recrystallization localize, which cause more serious decrease of LCF.

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張衛(wèi)方,劉 肖,劉升旺,王宗仁,李運(yùn)菊.扭轉(zhuǎn)預(yù)變形對(duì)定向凝固DZ4合金低周疲勞壽命的影響[J].稀有金屬材料與工程,2012,41(9):1602~1606.[Zhang Weifang, Liu Xiao, Liu Shengwang, Wang Zongren, Li Yunju. Influence of Torsional Pre-deformation on the Low Cycle Fatigue Life of Directionally Solidified Superalloy DZ4[J]. Rare Metal Materials and Engineering,2012,41(9):1602~1606.]
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  • 收稿日期:2011-09-18
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