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人们早已发现,材料成分和组织结构是影响SR裂纹产生的重要因素。探测这些因素的手段有许多。本文采用焊接热模拟试验技术,通过金相,显微硬度和电子衍射等手段,观察了不同最高加热温度下组织变化规律及第二相析出行为。以此为依据确定第二相溶解温度和析出的最敏感温度。从而选择组织热模拟的最佳条件。进而以模拟试样探讨了含硼钢SR裂纹敏感性的原因,并根据蠕变变形理论的再热裂纹成因分析,及不同冷却速度和焊后热处理温度对SR裂纹影响的试验数据,提供控制和防止再热裂纹产生的颇为有效的措施。
It has long been discovered that material composition and microstructure are important factors that influence SR cracking. There are many ways to detect these factors. In this paper, the welding thermal simulation test technology, through the means of metallography, microhardness and electron diffraction, observed under different maximum heating temperature microstructure changes and precipitation behavior of the second phase. Based on this determination of the second phase dissolution temperature and precipitation of the most sensitive temperature. Thus selecting the best conditions for tissue thermal simulation. Based on the analysis of the causes of reheat cracking and the experimental data on the effects of different cooling rates and post-weld heat treatment temperatures on the SR crack, a simulation experiment was conducted to find out the reason for the SR crack susceptibility of boron-containing steel. To prevent reheat cracks produced quite effective measures.