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本文研究了热轧板(卷)断口分层形成的冶金因素。钢中存在与轧面平行的脆弱显微平面(延伸的夹杂物和树枝状偏析等)是产生分层的内在因素,当它们在断裂面下严重偏聚时,在断裂过程中厚向应力的作用下引起厚向分离,形成断口分层。沿晶脆化带的形成是由于卷曲后缓慢冷却过程中,磷等杂质元素从晶内向晶界扩散产生的回火脆性。低温轧制(低于A_(r3))产生平行板面的(100)织构时,分层裂纹以解理方式扩展。形成分层的必要条件是金属基体具有足够高的韧性,使试样在断裂过程中发生塑性变形。控制能量冲击试验结果和分层壁上脆性平面存在波纹状滑移线,说明分层裂缝产生于主断口断裂之前。
In this paper, the metallurgical factors of stratified formation of hot rolled plate (coil) fracture were studied. The presence of brittle microscopic planes (inclusions and dendrites, etc.) parallel to the rolling surface in the steel is an inherent factor in the delamination. When they are severely segregated at the fracture surface, Under the action caused by thick separation, the formation of fracture stratification. The formation of crystal embrittlement is due to temper embrittlement caused by the diffusion of impurity elements such as phosphorus from the grain boundary to the grain boundary during the slow cooling after curling. When cold rolling (less than A r3) produces a (100) texture with parallel plate surfaces, delamination cracks propagate cleavely. The necessary conditions for the formation of stratification are that the metal matrix has sufficiently high toughness that the plastic deformation of the sample occurs during the fracture. Controlling energy impact test results and the presence of corrugated slippage lines on the brittle plane in the delaminated wall indicate that the delamination cracks occurred before the main fault fracture.