热处理
熱處理
열처리
HEAT TREATMENT
2014年
4期
65-68
,共4页
50CrVA钢%碟形弹簧%显微组织%疲劳断裂%加工硬化
50CrVA鋼%碟形彈簧%顯微組織%疲勞斷裂%加工硬化
50CrVA강%설형탄황%현미조직%피로단렬%가공경화
50CrVA steel%dished spring%microstructure%fatigue fracture%work-hardening
50CrVA钢制油缸用碟形弹簧在服役的早期发生断裂。采用直读光谱仪、洛氏硬度计、金相显微镜、扫描电镜等对该碟形弹簧的化学成分、硬度、非金属夹杂物、表面脱碳层、显微组织和断口形貌进行了分析。结果表明，50CrVA钢碟簧断裂是疲劳断裂，裂纹源由支撑面的加工硬化表层与次表层中的夹杂物共同作用所形成。提高碟簧使用寿命的措施是改善原材料的纯净度和提高表面加工质量。
50CrVA鋼製油缸用碟形彈簧在服役的早期髮生斷裂。採用直讀光譜儀、洛氏硬度計、金相顯微鏡、掃描電鏡等對該碟形彈簧的化學成分、硬度、非金屬夾雜物、錶麵脫碳層、顯微組織和斷口形貌進行瞭分析。結果錶明，50CrVA鋼碟簧斷裂是疲勞斷裂，裂紋源由支撐麵的加工硬化錶層與次錶層中的夾雜物共同作用所形成。提高碟簧使用壽命的措施是改善原材料的純淨度和提高錶麵加工質量。
50CrVA강제유항용설형탄황재복역적조기발생단렬。채용직독광보의、락씨경도계、금상현미경、소묘전경등대해설형탄황적화학성분、경도、비금속협잡물、표면탈탄층、현미조직화단구형모진행료분석。결과표명，50CrVA강설황단렬시피로단렬，렬문원유지탱면적가공경화표층여차표층중적협잡물공동작용소형성。제고설황사용수명적조시시개선원재료적순정도화제고표면가공질량。
Premature fracture of 50CrVA steel dished spring used in a oil vat occurred in service.The chemical composition,hardness,non-metallic inclusions,decarburized case,microstructure and fracture morphology of the dished spring were checked by direct-reading spectrometer,Rockwell hardness tester,OM and SEM.The results show that the rupture of the 50CrVA dished spring is a fatigue fracture,and the crack initiation arises from the action of work-hardened case of the support surface in combination with inclusions in the sublayer.Service life of the dished spring may be increased by an improvement on the raw material purity and increase in working quality of the surface.
