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| 掺入α-Al2O3的激光熔覆层残余应力的光致发光光谱测量* |
| Measurement of residual stress in laser cladding layer incorporating α-Al2O3with photoluminescence spectroscopy |
| 投稿时间：2024-02-21 修订日期：2024-06-03 |
| DOI： |
| 中文关键词: 激光熔覆 残余应力 光致发光光谱 α-Al2O3掺杂比例 |
| 英文关键词:Laser cladding Residual stress Photoluminescence spectrum Blending ratio of α-Al2O3 |
| 基金项目:天津市教委科研计划项目（2022ZD024） |
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| 中文摘要: |
| 开展激光熔覆层残余应力的定量测量对于零部件的性能评估和寿命预测至关重要。针对以α-Al2O3: Cr3+为传感媒介的激光熔覆层残余应力的光致发光光谱测量方法,研究粉体材料中α-Al2O3的优选掺入比例、应力计算方法以及掺入比例对熔覆层残余应力的影响。制备了五种α-Al2O3含量的Co基激光熔覆层并进行光致发光光谱测量,分析了可用光致发光光谱信号量随α-Al2O3含量的变化,结合硬度与耐磨性实验确定α-Al2O3的优选掺入比例；分析仅使用R1峰、仅使用R2峰、联合使用R1和R2峰信息三种方式计算得到的应力值的差异,以及α-Al2O3的掺入比例对激光熔覆层残余应力的影响。结果表明,激光熔覆层的可用光致发光光谱信号量随α-Al2O3的含量先增大后减小,10wt.%可以作为Co基激光熔覆层光致发光光谱应力测量的α-Al2O3优选掺入比例；仅用R2峰的偏移量计算得到的静水应力分量的值更接近于联合使用两个峰偏移量的计算结果；本文选定的α-Al2O3的不同掺入比例几乎不影响激光熔覆层的残余应力的大小。 |
| 英文摘要: |
| Quantitative measurement of laser cladding residual stress is essential for the performance evaluation and life prediction of parts. In this paper, a photoluminescence spectrum measurement method for residual stress in laser cladding with α-Al2O3: Cr3+ as sensing medium is presented. And the optimal ratio of α-Al2O3 in powder material, calculation method of stress and the effect of the mixing ratio on the residual stress of the cladding layer are studied. Five kinds of co-based laser cladding with different α-Al2O3 contents were prepared and measured by photoluminescence spectroscopy, the variation of available photoluminescence spectrum signal with α-Al2O3 content was analyzed, and preferred α-Al2O3 blending ratio based on hardness and abrasion resistance tests were determined. The difference of stress values calculated by using R1 peak only, R2peak only and R1 and R2 peak information was analyzed, and the effect of α-Al2O3 blending ratio on the residual stress of laser cladding layer was studied. The results show that, as the the α-Al2O3 content content changes, the available photoluminescence spectrum signal of the laser cladding layer increases first and then decreases. 10wt.% α-Al2O3 can be used as the optimal blending ratio for photoluminescence spectroscopic stress measurement of Co-based laser cladding layer. The value of hydrostatic stress component calculated by using only the offset of R2 peak is closer to the calculation result by using both offset of peaks. The different blending ratios of α-Al2O3 selected in this paper almost have no effect on the residual stress of the laser cladding layer. |
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