期刊论文

Analysis on Fracture Failure Mechanism of 85Cr18Mo2V Intake Valve

中文

热加工工艺

1001-3814

2016

45

6

256-257,260

10.14158/j.cnki.1001-3814.2016.06.073

衡阳市科学技术发展计划项目（2013k J03）；

本校为第一机构

利用JSM-6490LA型扫描电镜、GX51型奥林巴斯倒置金相显微镜及TH320全洛氏硬度计等仪器,对85Cr18Mo2V进气门的断裂失效样件进行宏观形貌和微观组织观察、化学成分检测和硬度测试,探讨进气门断裂失效机理。结果表明:当原材料C、Si、O含量偏高,或后续热加工工艺不当,会使组织成分不均匀,冲击韧性和疲劳强度降低,进气门的脆性增加,导致其在恶劣的工作环境下发生高周疲劳断裂。

By JSM-6490LA SEM, Olympus GX51 stereomicroscope and TH320 Rockwell apparatus, the macro -morphology and microstructure observation, chemical composition testing and hardness testing of 85Crl 8Mo2Vintake valve were carried out. The fracture failure mechanism of intake valve was discussed. The results show that under high content of C, Si and O in raw material or improper subsequent hot working technology, the microstructure composition is uneven, and then, the impact toughness and fatigue strength reduce, the brittleness of intake valve increases. At last, high cycle fatigue fracture appears i...