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粉末高溫合金加工表面顯微結構和力學性能變化研究
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齊魯工業(yè)大學機械與汽車工程學院,齊魯工業(yè)大學機械與汽車工程學院,齊魯工業(yè)大學機械與汽車工程學院

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中圖分類號:

TH161

基金項目:

國家自然科學基金項目（面上項目，重點項目，重大項目）,中國博士后科學基金


Microstructure and Mechanical Properties Transformation in the Machined Surface of Powder Metallurgy Superalloy Du Jin1,Zhang Jingjie1,Wang Liguo1
Author:
Affiliation:

School of Mechanical & Automotive Engineering, Qilu University of Technology,,

Fund Project:

National Natural Science Foundation of China,,China Postdoctoral Science Foundation

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    摘要:

    在切削加工粉末高溫合金過程中,合金已加工表面承受著嚴重的塑形變形會出現(xiàn)顯微組織結構和力學性能的變化。已加工表面出現(xiàn)的白層體現(xiàn)著加工表面顯微結構和力學性能的變化,對合金加工表面質(zhì)量的影響至關重要。為了揭示粉末高溫合金已加工表面顯微組織結構和力學性能的變化,開展了切削速度對粉末高溫合金FGH95已加工表面白層形成影響的研究。研究發(fā)現(xiàn)隨著切削速度的提高,FGH95合金已加工表面出現(xiàn)的白層厚度增大。對加工表面進行顯微觀察發(fā)現(xiàn)在表面覆蓋著一層致密的、無明顯組織特征的白層結構。通過對加工前后材料的XRD測試分析得出FGH95粉末高溫合金的基體材料以Ni基固溶體的形式存在,而已加工表面的顯微組織結構則明顯不同。這說明在切削過程中,粉末高溫合金已加工表面發(fā)生了Ni基固溶體組織結構的變化。對加工表面進行晶粒度測量發(fā)現(xiàn),切削速度越高晶粒細化現(xiàn)象越明顯。對合金切削表面白層進行力學性能測試表明,白層的顯微硬度隨著切削速度的提高而增大；存在合金已加工表面白層中的殘余應力為拉應力,且隨著切削速度的提高而增大。粉末高溫合金已加工表面顯微結構和力學性能變化的研究可以明確合金表面完整性的形成機理,可為表面質(zhì)量的預測和控制提供理論依據(jù)。

    Abstract:

    During the machining of powder metallurgy (PM) superalloy parts, the machined surface undergoes severe plastic deformation which appears to be in the form of microstructure and mechanical properties transformation. White layer which is belong to the microstructure and mechanical properties transformation, usually generated on the machined surface during hard machining of PM superalloy, it has significant effect on the machined surface quality. The effect of cutting speed on the white layer formation has been successfully investigated in order to illustrate the microstructure and mechanical properties transformation in the machined surface of PM superalloy FGH95. White layer thickness on the machined surface increased with the increasing of cutting speed. The investigation results showed that machined surface exhibited densification with no obvious structural features characteristics. FGH95 superalloy bulk material existed in the form of Ni-based solid solution, while the microstructure of white layer was observed significantly different from bulk materials. It’s because of the transformation of microstructure presented in the form of Ni-based solid solution in FGH95 during the cutting process. The higher the cutting speeds more severe grain refinement, which will leads to higher values of hardness in white layer. Residual stresses in the machined surface of FGH95 were seems to be observed tensile in all cutting conditions and it was observed an increasing trend with respect to the increment of cutting speed. The microstructure and mechanical properties transformation in the machined surface of PM superalloy was revealed in order to identify the mechanism of machined surface integrity, it can be provide the theoretical basis for the controlling of machined surface quality.

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引用本文

杜勁,張靜婕,王立國.粉末高溫合金加工表面顯微結構和力學性能變化研究[J].稀有金屬材料與工程,2018,47(8):2275~2282.[dujin, Zhang Jingjie, Wang Liguo. Microstructure and Mechanical Properties Transformation in the Machined Surface of Powder Metallurgy Superalloy Du Jin1,Zhang Jingjie1,Wang Liguo1[J]. Rare Metal Materials and Engineering,2018,47(8):2275~2282.]
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  • 收稿日期:2017-01-26
  • 最后修改日期:2017-03-06
  • 錄用日期:2017-08-18
  • 在線發(fā)布日期: 2018-10-17
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