<正> 过热淬火组织以中速加热时,将得到等轴奥氏体晶粒.尽管此时观察到的奥氏体晶粒已经细化,但仍可能出现断口遗传,得到粗晶断口.这种断口遗传的机理到目前为止,还未完全弄清. 引起这种断口遗传的原因之一,是在第一次
Such inheritance of fracture is a pseudo-inheritance of fracture if the quenching structure, overheated not too seriously, of the alloy structural steel 40CrNi underwent requenching from normal quenching temperature reheating up at medium rate. This coarse grain fracture, showing one of the priorly overheated coarse austenite grain, is, in reality, fine grain fracture along fine equiaxial austenite grain boundary formed on reheating at medium rate. So it is called the pseudo-inheritance of fracture. It seems to be not affected on the impact toughness. The origin of pseudo-inheritance of fracture has been discussed.
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