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首页> 外文期刊>Materials Characterization >Quantitative metallographic characterization of welding microstructures in Ti-containing TWIP steel by means of image processing analysis
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Quantitative metallographic characterization of welding microstructures in Ti-containing TWIP steel by means of image processing analysis

机译：通过图像处理分析通过图像处理分析定量金相表征Ti含有Ti的Twip钢中的焊接微结构

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摘要

Recrystallization and grain growth phenomena in Ti-containing Twining Induced Plasticity (TWIP-Ti) steel weld joints were studied. The joints obtained through the autogenous Gas Tungsten Arc Welding (GTAW) process at different heat inputs were characterized taking into account their grain size distribution and the particle pinning. The temperature ranges at which recrystallization and grain growth occurred in TWIP-Ti steel welds were determined. The optical micrographs were analyzed by means of MATLAB-based image analysis. In-house routines were added to perform grain size distribution/classification. The statistical analysis performed on micrographs by the image processing code indicated that TWIP-Ti steel showed a bimodal grain size distribution after the solution heat treatment. The static recrystallization (SRX) process detected in the low heat input weld joint, modified its bimodal grain size distribution to normal logarithmic (lognormal). The high heat input in TWIP-Ti steel weld kept the bimodal distribution. The presence of precipitated particles like Ti(C, N) and AIN generated microstructural stability in TWIP-Ti steel at temperatures 1050 degrees C. At higher temperatures, particle pinning by precipitates disappeared and abnormal grain growth was produced as a result of the pinning pressure decrease.
机译：研究了含Ti缠绕诱导可塑性（TWIP-TI）钢焊缝中的重结晶和晶粒生长现象。通过在不同热输入中通过自生气体钨弧焊（GTAW）工艺获得的关节表征考虑到它们的粒度分布和颗粒钉扎。确定在TWIP-TI钢焊缝中发生重结晶和晶粒生长的温度范围。通过基于MATLAB的图像分析分析光学显微照片。加入内部惯例以进行粒度分布/分类。通过图像处理代码对显微照片进行的统计分析表明，在溶液热处理后，TWIP-TI钢显示双峰粒度分布。在低热量输入焊接接头中检测到的静态再结晶（SRX）过程，将其双峰粒度分布修改为正常对数（Lognormal）。 Twip-Ti钢焊接中的高热量保持双峰分布。在温度下，在Ti（C，N）和AIN中存在沉淀颗粒和AIN产生的微观结构稳定性。在较高温度下，1050℃，由于钉扎压力降低，通过沉淀物消除沉淀物消失并且产生异常的晶粒生长。

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