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缺口對(duì)GH3536鎳基高溫合金蠕變性能的影響
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國家自然科學(xué)基金（50905142，51210008）；西北工業(yè)大學(xué)基礎(chǔ)研究基金（JC20120230，JC201239）


Influence of Notch on Creep Properties of GH3536 Nickel-Based Superalloy
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    摘要:

    針對(duì)GH3536鎳基高溫合金無應(yīng)力集中和帶典型應(yīng)力集中圓棒試樣在160，200，240 MPa應(yīng)力條件下的高溫(750 ℃)蠕變性能進(jìn)行了試驗(yàn)和有限元分析，研究了缺口的存在對(duì)材料蠕變性能的影響。采用掃描電鏡分析了試樣斷口的形貌，確定了材料的斷裂機(jī)制。結(jié)果表明：缺口的存在對(duì)GH3536鎳基高溫合金試件的蠕變性能影響較大，其降低了試件的最大蠕變應(yīng)變及在蠕變各個(gè)階段的蠕變速率。缺口對(duì)試件的蠕變壽命存在硬化作用，缺口根部軸向應(yīng)力的再分配和松弛可簡單認(rèn)為是導(dǎo)致缺口對(duì)該合金蠕變壽命起硬化作用的影響因素。斷口形貌分析表明由于缺口的存在，2種試件的表面形貌雖有不同，但蠕變斷裂機(jī)理都是由微孔洞不斷增大與聚集引起的。

    Abstract:

    High-temperature (750 oC) creep tests of smooth and notched specimens were performed, and the creep properties of GH3536 nickel-base superalloys were investigated under the tension loading of 160 MPa, 200 MPa and 240 MPa. The creep fracture mechanism was revealed with the scanning electron microscopy (SEM) analysis of the fracture surface and finite element analysis (FEM) of the stress distributions. The results show that notches reduce both of the creep deformation and the creep rate compared with the smooth specimen. The FEM analysis indicates that the axial stress redistribution and relaxation in the notch root benefit the creep properties of the specimen and lead to longer creep life. The SEM analysis shows that although the surface morphology is different, the growth and accumulation of microspores are the main factors of creep fracture for both smooth and notched specimens.

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劉 浩,王心美,劉大順,溫志勛,岳珠峰.缺口對(duì)GH3536鎳基高溫合金蠕變性能的影響[J].稀有金屬材料與工程,2014,43(10):2473~2478.[Liu Hao, Wang Xinmei, Liu Dashun, Wen Zhixun, Yue Zhufeng. Influence of Notch on Creep Properties of GH3536 Nickel-Based Superalloy[J]. Rare Metal Materials and Engineering,2014,43(10):2473~2478.]
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  • 收稿日期:2013-10-20
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  • 在線發(fā)布日期: 2015-04-07
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