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本文研究了一块300×400×10mm的剥落块,这个剥落块是在轧制带钢时因事故从Φ400×1200mm的9Cr2Mo冷轧工作辊上剥落下来的.在剥落块的表面上粘结着带钢,在带钢下的轧辊表面上观察到一层厚度约0.06mm未经回火的马氏体组织,此层下面还有一个具有低硬度的回火马氏体区域,晶间显微裂纹就从此两区域之间发生,然后垂直地向里向外扩展.裂纹的发生是由于相变时不同的体积改变所造成的拉应力引起的,而相变是由于事故发生时的热冲击所导致.本文还对减少此种失效的措施提出了建议.
In this paper, a 300 × 400 × 10mm peel-off block was peeled off from a 9Cr2Mo cold-rolled work roll of Φ400 × 1200mm due to an accident during the rolling of the strip, and the surface of the peel- Steel, a layer of martensite having a thickness of about 0.06 mm, which has not been tempered, is observed on the surface of the roll under the strip steel. There is also a tempered martensite region with a low hardness below this layer with intergranular microcracks Then occurs between the two regions and then vertically inwardly and outwardly. Crack occurs due to tensile stress caused by different volume changes during phase transition, which is caused by the thermal shock at the time of the accident The paper also suggests ways to reduce such failures.