GH4169高溫合金端面車削表面變質(zhì)層的形成機(jī)理

GH4169高溫合金端面車削表面變質(zhì)層的形成機(jī)理Formation Mechanism of Surface Metamorphic Layer on Turning End Face of GH4169 Superalloy

利用實(shí)驗(yàn)和DEFORM-3D有限元分析相結(jié)合的方法，通過(guò)分析不同加工參數(shù)下切削力、溫度和應(yīng)變場(chǎng)，以及殘余應(yīng)力、顯微硬度、微觀組織的變化，研究GH4169端面車削表面變質(zhì)層的形成機(jī)理。結(jié)果表明：表面變質(zhì)層的形成是熱力耦合作用于材料微觀組織的結(jié)果；加工強(qiáng)度增大，切削力和切削熱增大，表層金屬等效應(yīng)變?cè)龃?，塑性變形更加顯著，金相組織改變?cè)矫黠@，晶粒變形程度越大；在加工參數(shù)范圍內(nèi)，溫度影響層深度為130~200 μm，等效應(yīng)變層深度為100~220 μm，殘余應(yīng)力層為80~110 μm，硬化層深度為50~80 μm，表面變質(zhì)層深度為2.5~5 μm。

Turning experiments and Deform-3D finite element methods were used to study the formation mechanism of surface metamorphic layer on turning GH4169 processed. The investigations were carried out by analyzing the changing of cutting force, the temperature and strain field, the residual stress, micro-hardness, microstructure, as well as the distribution of the above all along the direction of the depth under various process parameters. The results show that the surface metamorphic layer is formed due to the thermal-mechanical coupled effects on the microstructure of the material in the machining process. The cutting force, heat and strain of surface material are increased with the increase of machining intensity. Besides the higher strength of machining, the greater changes of plastic deformation, metallographic and grain deformation are acquired. In the range of processing parameters, the temperature layer is 130-200 μm,the strain layer is 100-220 μm, the residual stress layer is 80-110 μm, the depth of hardening layer is 50-80 μm, and the depth of surface metamorphic layer is 2.5-5μm.

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