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钛高强钢具有成本优势,得到了广泛的应用,但添加钛易诱发板坯裂纹缺陷。针对w_(Ti)=0.1%的高强钢板坯火焰切割裂纹问题,采用ANSYS模拟了板坯火焰切割的过程及随后的温度变化,用光学显微镜分析了板坯裂纹形貌及组织、用热膨胀仪测定了w_(Ti)=0.1%的高强钢的温度-膨胀曲线,从板坯火焰切割后相变的角度探讨了裂纹形成原因。结果表明,w_(Ti)=0.1%的高强钢板坯火焰切割后,距切割面30mm以内冷却速度可达10℃/s以上,冷却速度快使板坯产生贝氏体和马氏体相变,导致了板坯火焰切割裂纹的产生。
Titanium high strength steel with cost advantages, has been widely used, but the addition of titanium easy to induce slab crack defects. Aiming at the problem of flame cutting crack of high strength steel slab with w = (Ti) = 0.1%, the slab flame cutting process and the subsequent temperature change were simulated by ANSYS. The crack morphology and microstructure of the slab were analyzed by light microscope. The temperature-expansion curve of high-strength steel w_ (Ti) = 0.1% was discussed. The causes of crack formation were discussed from the perspective of phase transformation after slab flame cutting. The results show that the cooling rate can reach 10 ℃ / s within 30mm from the cutting surface after the flame cutting of the high strength steel slab with w_ (Ti) = 0.1%. The cooling rate can make the slab produce bainite and martensite transformation, Leading to the slab flame cutting cracks.