摘要
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。
Aimed the cracking problems of hot roll after surfacing, taking into account martensitic phase transformation of the weld metal and base metal, and the ANSYS software was used to calculate the welding temperature field and stress field in the process of surfacing, and the temperature field and stress field was measured by experiment, which can verify the reasonableness of simulations. The results indicate that weld seam reduces from 1600 ℃ into 200 ℃ within 6 s time, resulting in the generation of the martensite. The simulation results and measurement results match good; the maximum tangential stress is located in the ends of weld, of which the stress on the left is tensile stress of 440 MPa, on the left for pressure stress of 409MPa, respectively. The tangential stress in weld center first increases and reaches the maximum value of 139 MPa, and decreases during the subsequent cooling process.
出处
《热加工工艺》
CSCD
北大核心
2014年第11期209-212,共4页
Hot Working Technology
关键词
热轧辊
堆焊
数值模拟
马氏体相变
hot rolling rolls
surfacing
numerical simulation
martensite transformation
