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屈强比是衡量金属材料均匀塑性变形能力的重要指标。本文对不同层间温度下690MPa级HSLA钢熔敷金属进行了室温拉伸,探讨组织对熔敷金属屈强比的影响规律。应用金相显微镜,透射电子显微镜对熔敷金属的显微组织进行了分析,并采用Lepera腐蚀法,对熔敷金属组织中M-A组元进行了观察。结果表明:层间温度的降低使熔敷金属的屈强比升高,层间温度从200℃降低到80℃,屈强比由0.781增加到0.82。进一步研究表明:随层温的降低,熔敷金属中M-A组元数量减少是造成屈强比升高的原因之一。
Yield ratio is a measure of the uniform plastic deformation of metallic materials an important indicator. In this paper, 690MPa grade HSLA steel deposited metal at different interlayer temperatures were stretched at room temperature to explore the impact of the organization on the deposited metal yield ratio. The microstructure of the deposited metal was analyzed by optical microscope and transmission electron microscope. The M-A component in the deposited metal was observed by Lepera etching method. The results show that the decrease of interlayer temperature increases the yield ratio of the deposited metal, the interlamellar temperature decreases from 200 ℃ to 80 ℃, and the yield ratio increases from 0.781 to 0.82. Further studies show that as the layer temperature decreases, the decrease of M-A component in the deposited metal is one of the reasons for the increase of the yield ratio.