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研究了奥氏体化温度对9Ni钢薄板组织性能的影响,并分析了薄板与厚板低温韧性差异的原因。奥氏体化温度高于800℃后,随着奥氏体化温度升高,奥氏体化温度对逆转奥氏体(γ′)的体积分数没有影响;奥氏体化后奥氏体晶粒尺寸减小,晶粒趋于等轴;组织均匀化程度提高;最终组织中取向差大于1 5°区域尺寸减小,低温韧性增加;板条或亚板条束的平均尺寸增加,强度降低。薄板中较小的平均取向差是其低温韧性较低的主要原因。
The effect of austenitizing temperature on the microstructure and properties of 9Ni steel sheets was studied and the reasons for the difference in low temperature toughness between the sheets and the slabs were analyzed. When the austenitizing temperature is higher than 800 ℃, as the austenitizing temperature increases, the austenitizing temperature has no effect on the volume fraction of reversed austenite (γ ’); austenite after austenite The grain size decreases and the grains become equiaxed; the degree of homogenization of the structure increases; the size of the final structure is larger than the 15 ° area, and the low temperature toughness increases; the average size of the lath or sub-lath increases and the strength decreases . The smaller average orientation difference in the sheet is the main reason for the lower low temperature toughness.