论文部分内容阅读
针对热轧辊在堆焊后产生裂纹的问题,在考虑堆焊金属及母材马氏体相变的情况下,采用ANSYS软件计算了其堆焊过程中的温度场和应力场,并对其温度场和应力场进行了实验测量,验证了模拟过程的合理性。结果表明,焊缝在6 s时间内从1600℃降低到200℃以下,导致马氏体的生成。模拟结果与测量结果吻合良好,最大切向应力位于焊缝的末端处,左端为拉应力,右端为压应力,大小分别为440和409 MPa;在焊缝中心处的切向应力先增大,并达到最大值139 MPa,在随后的冷却过程中逐渐减小。
Aiming at the problem that the hot roll cracks after welding, the temperature field and the stress field in the surfacing process are calculated by ANSYS software considering the martensitic transformation of the surfacing metal and the base metal. The temperature Field and stress field experiments were conducted to verify the rationality of the simulation process. The results show that the weld seam decreases from 1600 ℃ to below 200 ℃ within 6 s, which leads to the formation of martensite. The simulation results are in good agreement with the measured results. The maximum tangential stress is located at the tip of the weld, with tensile stress at the left end and compressive stress at the right end, respectively, 440 and 409 MPa in size. Tangential stress at the weld center first increases, And reached a maximum of 139 MPa, gradually decreasing during the subsequent cooling.