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在珠光体转变的温度范围内,除下珠光体区域的停留促进上珠光体区的形核过程外,奥氏体在非连续冷却时,转变的形核过程具有相加性。在下珠光体区的形核过程中,可能先形成与奥氏体共格的核胚。在贝菌体转变的温度范围内,较高温度的停留延缓较低温度时的形核过程,延缓作用随温度间隔及停留时间的增加而增大。较低温度的停留促进较高温度时的形核过程,促进作用随温度间隔的增加而增大,但随时间的延长而减小。建议贝茵体的核胚和马氏体的相同,即位错圈所包围的体心立方结构区域。下珠光体区停留促进贝茵体的形核过程。
In the pearlite transformation temperature range, the addition of the pearlite region to stay in the pearlite region to promote the nucleation process, the austenite in the discontinuous cooling, the transition nucleation process is additive. In the process of nucleation in the lower pearlite region, it may be possible to form nuclei that are coherent with austenite first. In the temperature range of transformation, the higher temperature retarded the nucleation process at lower temperature, and the retardation increased with the increase of temperature interval and residence time. The retention at a lower temperature promotes the nucleation at a higher temperature, the promoting effect increases with increasing temperature interval, but decreases with time. It is suggested that the nucleosomes and martensite of bainite are the same, that is, the body-centered cubic structure surrounded by dislocation loops. Lower pearlite area to stay and promote the bivalve nucleation process.