苏勇,田素贵,张顺科,于莉丽,于慧臣.横向预压缩对<001>取向镍基单晶高温合金蠕变性能的影响[J].稀有金属材料与工程,2016,45(1):79~85.[suyong,Tian Sugui,Zhang Shunke,Yu Lili,Yu Huichen.Effect of Transverse Pre-Compression on High-Temperature Creep Behavior of <001> Oriented Single Crystal Nickel-Based Superalloy[J].Rare Metal Materials and Engineering,2016,45(1):79~85.]
横向预压缩对<001>取向镍基单晶高温合金蠕变性能的影响
投稿时间:2014-03-03  修订日期:2014-10-16
中文关键词:  预压缩  蠕变  高温合金  滑移系  微观组织
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      通过蠕变性能测试及组织形貌观察,研究了预压缩对某[001]取向镍基单晶高温合金蠕变性能的影响。结果表明,[001]取向镍基单晶高温合金在1040 ℃/180 MPa条件下沿[100]方向预压缩40 h后,立方g?相转化为一维的平行于压应力轴的P型纤维状筏状组织。合金晶向及预压缩和拉伸蠕变应力轴取向误差是预压缩合金内纤维状g?相发生横向连接的原因。合金在预压缩及后续拉伸蠕变过程中g?g相界面能的降低是g?相发生组织演化的驱动力。相对于未预压缩合金,预压缩后合金的微观组织结构使位错更容易在基体通道中滑移,其对合金沿[001]方向的应变率贡献更大,因此预压缩降低了合金在980 ℃/200 MPa条件下的蠕变抗力。
Effect of Transverse Pre-Compression on High-Temperature Creep Behavior of <001> Oriented Single Crystal Nickel-Based Superalloy
英文关键词:pre-compression  creep  superalloys  slip systems  microstructure
英文摘要:
      By means of creep tests and microstructure observations, the effect of transverse pre-compression on high-temperature creep behavior of a [001] oriented single crystal nickel-based superalloy was studied. Results show that after being pre-compressed along [100] orientation at 1040 篊/180MPa for 40 h, the cuboidal g?phase has been transformed into one-dimensional P-type stripe-like rafts parallel to the compressive stress axis. The misorientations of the alloy and stress axis of pre-compression and tensile creep are responsible for the transverse connection of the stripe-like g?rafts. The decrease of the interfacial energy of g?g phases is the driving force of the microstructure evolution during the pre-compression treatment and the subsequent tensile creep test of the alloy. Compared to the alloy without pre-compression, the microstructure of the pre-compressed alloy makes the dislocation slip in matrix channels more easily, which has more contributions to the strain rate of the alloy along [001] orientation, so the pre-compression decreases the creep resistance of the alloy at 980 篊/200 MPa.
作者单位E-mail
苏勇 沈阳化工大学 suyong_1979@126.com 
田素贵 沈阳工业大学材料科学与工程学院 tiansugui2003@163.com 
张顺科 沈阳化工大学  
于莉丽 沈阳工业大学  
于慧臣 北京航空材料研究院  
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