Quantitative Analysis of Microstructure in Welded Joint by Image Processing Technique

图像处理技术对焊接接头显微组织的定量分析

• 批准号: 60850138
• 负责人: INOUE Katsunori
• 金额: $ 10.11万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60850138/
• 关键词: Image processing; Microstructure; Particle analysis; CO_2 laser; Temperature distri-bution; Computer simulation; Thermophysical property; レーザフラッシュ法; 画像解析; 材料の組織; ビーム加工; 高エネルギ溶射; 皮膜の熱物性値; テキスチャー解析; 形状係数; 周囲長; レーザ熱硬化処理; コンピュータシュミレーション; テクス

The purpose of this study is the quantitaitve estimation ans analysis of the microstructure of metals and alloys and its changing process with the thermal history in the welding, the heat treatment, etc., utilizing the image processing technique. The present theme is composed of the following three parts:1) Decelopment of a new method for the quantitative estimation of the microstructure by the image processing technique, and its application. 2) The simultaneous measurement of the thermal history and the estimation of the microstructural changes under the rapid heating and cooling process. 3) Measurement of the thermophysical properties of the works for the above estimation and developement of some new methods for determination of the thermophysical properties.The results obtained are summarized as follows:1) A new method for the digital length measurement of the perimeter of the relatively small images was proposed, which was named the "three pixel method", and usefulness of this method was confirmed in the particle analysis of microstructure and the nondestructive estimation of the weld defect. 2) A simple measuring system, which was composed mainly of an infrared camera and an image processor, was constructed to estimate the temperature distribution in the work with CW CO_2 laser irradiation. On the other hand, a computer simulation system on structural changes of hypoeutectoid steel in laser transformaion hardening was also developed. 3) The laser flash method was applied to both the laser-beam-penetrative materials and the two-layer composites with the thermal contact resistance at the interface of the layers, in order to determine thermal diffusivity. Two new methods were developed and the effectiveness was confirmed experimentally.

本研究的目的是利用图像处理技术定量估计和分析金属和合金的显微组织及其在焊接、热处理等过程中随热历史的变化过程。本主题由以下三个部分组成：1）基于图像处理技术的微观结构定量估计新方法的开发及其应用。 2）同时测量热历史并估计快速加热和冷却过程下的微观结构变化。 3）对工程热物性的测量，为上述估计和开发了一些测定热物性的新方法。得到的结果概括如下：1）提出了一种对相对较小的图像周长进行数字长度测量的新方法，命名为“三像素法”，并证实了该方法在微观结构和无损颗粒分析中的有用性。 焊接缺陷的估计。 2)构建了一个主要由红外相机和图像处理器组成的简单测量系统，用于估计连续波CO_2激光照射下工作中的温度分布。另一方面，还开发了亚共析钢激光相变硬化组织变化的计算机模拟系统。 3) 将激光闪光法应用于激光束穿透材料和具有层界面接触热阻的双层复合材料，以确定热扩散率。开发了两种新方法并通过实验证实了其有效性。

项目成果

Katsunori, INOUE.: "Computer Simulation on Transformation Process of Steel on Rapid Heating (Report 1)" Transactions of JWRI. 16. 97-101 (1987)

Katsunori, INOUE.：“钢快速加热转变过程的计算机模拟（报告 1）”JWRI 交易。

Katsunori, INOUE.: "Computer Simulation on Structural Changes of Hyp0-Eutectoid Steel in Laser Transformation Hardening (in Japanese)" Transactions of the Japan Society of Mechanical Engineers Series C. 54. 1026-1034 (1988)

Katsunori, INOUE.：“激光相变硬化中次共析钢结构变化的计算机模拟（日文）” 日本机械工程学会会刊系列 C. 54. 1026-1034 (1988)

井上勝敬: 日本機械学会論文集, C編. 54. 1026-1034 (1988)

Katsutaka Inoue：日本机械工程师学会会议录，C 版 54. 1026-1034 (1988)。

Transaction of JWRI. 15-1. (1986)機械学会論文集.

JWRI 交易。(1986) 日本机械工程师学会会议记录。

井上勝敬: 溶接学会論文集. 6. 442-446 (1988)

Katsutaka Inoue：焊接学会会议记录 6. 442-446 (1988)。