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首页> 外文期刊>Journal of Manufacturing Processes >Comparison on grindability and surface integrity in creep feed grinding of GH4169, K403, DZ408 and DD6 nickel-based superalloys
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Comparison on grindability and surface integrity in creep feed grinding of GH4169, K403, DZ408 and DD6 nickel-based superalloys

机译：GH4169，K403，DZ408和DD6镍基高温合金的蠕动进给磨削中的可磨性和表面完整性比较

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摘要

Comparative study was conducted on the grindability of wrought GH4169, equiaxial cast K403, directionally solidified cast DZ408 and single crystal DD6 superalloys by using the brown alumina wheels during the creep feed grinding process with regard to the grinding force, grinding ratio, wheel wear and surface integrity. The grinding forces were found to increase in the following order: DD6, GH4169, K403 and DZ408; and DD6 alloy had the largest grinding ratio, followed by GH4169, K403 and DZ408. In addition, the workpiece material adhesion and grain wear flats were found to be the main pattern of wheel wear in the grinding of DZ408, K403 and GH4169 alloys, while it was the wheel clogging for DD6 alloy. Irrespective of the workpiece material, the microhardness alternation of subsurface induced by thermal effect dominated over the mechanical effect with the increasing material removal rate (up to 6 mm(3) /(mm s)) and the softened level was 10-16.5 % to a depth of around 40 mu m in this study. The surface defects, the highly deformed subsurface and the generation of micro cracks within the workpiece were found to be the main types of damage induced by the grinding operation. These results can provide insights into the effect of workpiece material on the grindability of different nickel-based superalloys in the investigation.
机译：在蠕动进给磨削过程中，通过使用棕色氧化铝轮对锻造GH4169，等轴铸K403，定向凝固铸DZ408和单晶DD6高温合金的可磨性进行了研究，研究了它们的磨削力，磨削比，砂轮磨损和表面诚信。发现磨削力按以下顺序增加：DD6，GH4169，K403和DZ408; DD6合金的磨削比最大，其次是GH4169，K403和DZ408。此外，在DZ408，K403和GH4169合金的磨削中，发现工件材料的附着力和磨粒平整度是砂轮磨损的主要方式，而DD6合金则是砂轮堵塞。不管工件材料如何，随着材料去除率的提高（最高6 mm（3）/（mm s）），热效应引起的表面下的显微硬度变化在机械效果上占主导地位，软化水平为10-16.5％。这项研究的深度约为40微米。发现表面缺陷，高度变形的次表面以及工件内部微裂纹的产生是由研磨操作引起的主要损伤类型。这些结果可以深入了解工件材料对研究中不同镍基高温合金可磨性的影响。

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