Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (6): 846-851.DOI: 10.12068/j.issn.1005-3026.2020.06.015

• Mechanical Engineering • Previous Articles     Next Articles

Experimental Study on the Grinding Metamorphic Layer of Nickel-based Single Crystal Superalloy

GONG Ya-dong, ZHANG Wei-jian, CAI Ming, ZHOU Xian-xin   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Received:2019-03-08 Revised:2019-03-08 Online:2020-06-15 Published:2020-06-12
  • Contact: GONG Ya-dong
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Abstract:

In order to explore the processing property of grinding metamorphic layers of nickel-based single crystal superalloy, a single-factorial plain grinding experiment was conducted to investigate the effect of different grinding parameters and cooling conditions on the thickness of grinding metamorphic layers. The results showed that the grinding metamorphic layer with certain thickness appears on the grinding surface and subsurface of nickel-based single crystal superalloy DD5. The γ phase and γ′ phase in the plastic deformation layer of the metamorphic layer are distorted severely, and the hardness of the grinding metamorphic layer is greater than that of the matrix. The grinding metamorphic layer thickness varies with the grinding parameters and cooling conditions. With the increase of grinding wheel tangential velocity, the metamorphic layer thickness first decreases, and then increases; with the increase of grinding depth, the metamorphic layer thickness increases continuously; with the increase of workpiece feed velocity, the metamorphic layer thickness first increases, and then decreases. Within the range of experiment parameters, the minimum quantity lubrication (MQL) cooling condition can reduce the corresponding grinding metamorphic layer thickness, which can be reduced by up to 3.5μm.

Key words: interval multi-objective optimization, interval particle swarm optimization, intervalnickel-based single crystal superalloy, grinding, grinding metamorphic layer, plastic deformation, grinding parameter

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