定向凝固高温合金中钨对固溶强化的作用
THE EFfECT OF TUNGSTEN ON SOLID SOLUTION STRENGTHENING FOR DIRECTIONALLY SOLIDTFIED (DS) NICKEL-BASE SUPERAALLOYS
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摘要: 本文研究了钨对定向凝固镍基高温合金蠕变性能的作用，选用的三个合金是DZ17G(0%W),DZ17GW(3.8%W)和DZ3(5.4%W)。试验结果表明:对于含少量W或不含W的镍基高温和金、定向凝固对提高蠕变性能的作用很小，相反，对含有i较高W的高温合金，定向凝固的效果很好。在稳态蠕变阶段，直接作用在位错上的有效应力可以定义为作用在试样上的外加应力减去一个背应力，此背应力产生于基体中其它位错的存在( s-固溶强化)和'粒子的存在(P-第二相粒子强化)，测定了稳态蠕变速率就可计算背应背应力。计算结果表明:三个定向凝固高温合金的P值几乎相同，但DZ17GW的蠕变性能比DZ17G高得多，含有较高W的DZ3合金的蠕变性能最好，这就证明W在定向凝固高温一合金中的主要作用是提高l固溶体体的强度，因此，在设计定向凝固高温合金时必须考虑W这个元素。Abstract: The effect of tungsten on creep property for DS nickel-base superalloys,DZ17G(0%W)，DZ17GW(3.8%W) and DZ3 (5.4%W) has been investigated.It has been found that the effect of directional solidification on incrcasin; the creep property is little for nickel-base superalloys containing a small amount of W or wiihowt W, Converscly,the use of DS is benifial fo[superalloy containing higher content of W, Durins steady state creep，the effective stress acting directly on the dislocations can be defined as the difference between the stress applied to the sample and the back stress resulting from the presence of all other dislocation(s-solid solution strengthening)and. of' particles(Psecond phase pa rticle strengthening) in the matrix.The back stress was calculated by the measuring of steady start creep rate.It was indicated chat the aP of three DS superalloys is almo引equivalent.The stress rupture property is much higher for DZ17GW than that of DZ17G.The creep property is best for DZ3 coniaining higher content of W. It was de nonsiratecl that the role of W in DS superalloys is mainly increasing strength of solid solution marix. The tungsten must be considered in the desinn of DS superalloy.
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