锻压技术

85Cr18Mo2V钢质进气门断裂失效分析及预防措施

英文标题：Analysis and prevention measures of failure fracture for 85Cr18Mo2V steel intake valve

分类号：TG111.91

出版年,卷(期):页码：2014,39(5):6-8

摘要：

针对85Cr18Mo2V钢质进气门产生的失效断口，进行裂纹形貌观察和显微组织分析，结合生产实际进行工艺试验，找出裂纹产生的原因和形成机理，并提出有效的预防改进措施。试验表明，该种气门失效的主要原因与断裂处组织存在严重的网状碳化物有关，而严重网状碳化物的形成则与气门顶锻成形时的温度紧密相关。通过合理调节毛坯顶锻成形时的各种工艺参数如次级电压、加热时间等来调控温度，可有效避免或减少严重网状碳化物的产生，最终避免或减少气门盘部和颈部断裂现象的产生。

The crack morphology was observed and the microstructure was analyzed for the failure fracture produced by 85Cr18Mo2V steel intake door. Combined with actual production, the process test was conducted, the cause and formation mechanism of the crack were found, and the effective prevention and improvement measures were put forward. Experiments show that the main reasons of failure for valve are related to the serious network carbide in fracture tissue, and the forming of the network carbide is closely related by the temperature of valve upsetting. Through reasonable adjusting the parameters to control temperature when blank upsetting，such as secondary voltage, heating time, etc., the serious carbide network can be effectively avoided or reduced, which resulting in avoiding or reducing fracture for valve plate and neck.

基金项目：

湖南省衡阳市科技局重点资助项目（2013KJ03）

姚玲珍（1966-），女，大专，工程师

参考文献：

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