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奥氏体晶粒度的影响因素是多方面的,但是,我们曾指出,由于在现行标准中沿用了陈旧、不科学的“本质晶粒度”概念,使对奥氏体晶粒度的要求人为地苛刻了,由此所引起的错误判断可能是二十多年来造成奥氏体晶粒度大量不合的主要原因[1]。本文通过对经不同温度热处理的38CrA等五个钢号合结钢实际奥氏体晶粒度级别及平均晶粒直径的测定和比较分析,论述了钢的奥氏体晶粒度长大和粗化的规律性。实验结果证明:奥氏体晶粒长大和粗化过程是不均匀的,而且奥氏体晶粒粗化温度随表征晶粒度的单位不同而异,由此揭示了建立“本质晶粒度”概念的理论依据的局限性,并再次提出摒弃“本质晶粒度”概念,使奥氏体晶粒度的测定在实际热处理温度下进行。
The influencing factors of austenite grain size are many, however, we have pointed out that due to the obsolete, unscientific concept of “intrinsic grain size” inherited from current standards, the influence on austenite grain size The man-made requirements of the harsh, which caused the wrong judgment may be the main reason for the large number of non-austenite grain size over the past two decades [1]. In this paper, by measuring and comparing the actual austenite grain size and the average grain size of the five steel heat-treated 38CrA heat treated at different temperatures, the austenite grain size growth and coarsening Regularity. The experimental results show that the grain growth and coarsening process of austenite is inhomogeneous, and the coarsening temperature of austenite varies with the unit of grain size, thus revealing that the intrinsic grain size “Concept of theoretical limitations, and once again proposed to abandon the ” intrinsic grain size "concept, the determination of the austenite grain size at the actual heat treatment temperature.