利用化学成分分析、组织与断口观察、力学性能测试等方法分析了高强度35CrMo钢螺栓在缩径加工过程中的断裂原因.结果表明:35CrMo钢螺栓的断裂具有典型的脆性断裂特征;35CrMo钢组织的不均匀性导致其抗拉强度较低,在缩径加工的矫直工序中,当螺栓缩径部位的拉拔力较高时,螺栓断裂.
The reason for fracture of high-strength 35CrMo steel bolt during necking process was analyzed by the methods such as chemical composition analysis, microstructure and fracture observation and mechanical property testing.The results show that the fracture of 35CrMo steel bolt had a typical brittle fracture characteristic.The microstructue of the 35CrMo steel was non-uniform, resulting in the relatively low tensile strength.During the straightening of necking process, when the pulling force at the necking part of the bolt was relatively high, the bolt fractured.
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