The analytical results show that plastic yield occurs in the tip of V-shaped notch of 45 steel bar,20 steel bar and 60Si2Mn bar under the condition of given parameters,but the heat crack only appears in the tip point of V-shaped notch of 60Si2Mn bar.

• 研究结果表明,对于45%23钢、20%23钢、60Si2Mn棒料来说,在现有给定的参数下,其V型槽尖端均发生了塑性变形,但只有60Si2Mn棒料在其V型槽尖端点产生了热裂纹。