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| 图像相对法快速评价材料的高温能量耗散率与高温硬度 |
| Fast Evaluation of Energy-Dissipation Rate and Hardness of Material at High Temperature by Image Relative Method |
| 投稿时间：2024-01-09 修订日期：2024-06-28 |
| DOI： |
| 中文关键词: 高温能量耗散率 高温硬度 图像相对法 快速评价 |
| 英文关键词:high temperature energy-dissipation rate high temperature hardness image relative method fast evaluation |
| 基金项目:国家自然科学基金(52032011)资助项目 |
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| 中文摘要: |
| 利用高温原位显微摄像与高温试验机相结合进行高温压痕实验,简单而方便获得不同温度下载荷和压入深度的关系,提出图像相对法概念,攻克了高温下测量固体材料的能量耗散率、弹性恢复率和硬度的难题。提出同温相对法和异温相对法两种试验分析模型,前者用于同一温度下不同载荷形式的变形图片比较分析,获得材料在实验温度下的能量耗散率和弹性恢复率等高温性能；后者用于相同载荷不同温度之间的图像比较,快速获得不同温度下硬度与常温硬度的比值,根据温度增量自动照相而得到材料硬度随温度的变化规律。高温原位照片的场景和焦距固定,分辨率约为1 um。对氧化锆和高温合金K419的高温压痕试验显示,其能量耗散率随着温度升高而增大,硬度随着温度升高而不断下降。氧化锆在1000℃高温下能量耗散率达到88.5%,硬度为6.73 GPa。高温合金K419在1100℃的高温下能量耗散率达到96%,硬度只有常温硬度的三分之一。 |
| 英文摘要: |
| High-temperature indentation tests were carried out by using high temperature in-situ microscopy combined with high temperature testing machine, which is simple and convenient to obtain the relationship between load and indentation depth in samples at different temperatures. The goal of rapid measurement of energy-dissipation rate, elastic recovery rate and hardness at high temperature is achieved by image relative method. Two kinds of experimental analysis models are developed: the isothermal relative method and the heterotherm relative method. The former is to analyze the deformation pictures under different loads at the given temperature to obtain the high temperature properties of materials such as energy-dissipation rate, elastic recovery rate and so on. The latter is to analyze the deformation pictures under identical load at the different temperatures to obtain the ratio of hardness at high temperatures to the hardness at room temperature, so that the temperature dependence of hardness is obtained by automatic photography with equal temperature increment. The scene and focal length of each photograph are identical, and the resolution should be about 1 um. The high temperature indentation test of Zirconia and superalloy K419 showed that the energy dissipation rate increased with the increase of temperature, and the hardness decreased with the increase of temperature. Zirconia energy dissipation rate reaches 88.5% at 1000℃, and the hardness at 1000 ℃ was only 61% of that at room temperature. K419 energy dissipation rate reaches 96% at 1100℃, and the hardness at 1100 ℃ was only one third of that at room temperature. |
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