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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >On the influence of stress state, stress level and temperature on γ-channel widening in the single crystal superalloy CMSX-4
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On the influence of stress state, stress level and temperature on γ-channel widening in the single crystal superalloy CMSX-4

机译：应力状态，应力水平和温度对单晶高温合金CMSX-4γ通道扩宽的影响

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摘要

The present investigation describes the kinetics of γ-channel widening in the single-crystal superalloy CMSX-4 at temperatures above 1000℃ and at stress levels between 50 and 100 MPa. A miniature tensile creep specimen (uniaxial loading in < 001 > -direction) and a double shear creep specimen (biaxial loading of the macroscopic crystallographic shear system {011} < 011 > ) were used for interrupted creep testing. The volume fractions of the γ- and γ′-phases and the kinetics of γ-channel widening were investigated using high resolution scanning electron microscopy in combination with quantitative metallography. It was found that rafting always occurred perpendicularly to the direction of the maximum principal stress (i.e. perpendicular to the tensile direction in the tensile specimens and in 45° to the shear stress for the shear tests). Over the whole stress range, there was no significant difference between γ-channel widening in < 001 > tension and {011} < 011 > -shear creep deformation, when the experiments were performed at the same maximum principal stress. γ-Channel widening is an important process during creep of γ/γ′-microstructures because dislocations propagate in the thin γ-channels. Our present study shows how temperature, stress level and stress state affect this microstructural coarsening process. Superimposed stresses favour the γ-phase, and therefore channel widths increase faster with increasing superimposed stresses.
机译：本研究描述了单晶高温合金CMSX-4在1000℃以上的温度和50至100 MPa的应力水平下γ通道扩宽的动力学。微型拉伸蠕变试样（<001>方向的单轴载荷）和双剪切蠕变试样（宏观晶体剪切体系{011} <011>的双轴载荷）用于间断蠕变测试。利用高分辨率扫描电子显微镜结合定量金相学方法研究了γ相和γ′相的体积分数以及γ通道加宽的动力学。发现漂流总是垂直于最大主应力的方向发生（即垂直于拉伸试样中的拉伸方向，并且在剪切试验中与剪切应力成45°角）。在相同的最大主应力下进行实验时，在整个应力范围内，<001>张力中的γ通道加宽和{011} <011>-剪切蠕变变形之间没有显着差异。 γ通道展宽是γ/γ'微结构蠕变过程中的重要过程，因为位错在较薄的γ通道中传播。我们目前的研究表明温度，应力水平和应力状态如何影响该组织的粗化过程。叠加应力有利于γ相，因此通道宽度随着叠加应力的增加而更快地增加。

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