摘要
借助化学成分、金相显微镜、扫描电镜、能谱分析等方法对具有裂纹的45钢锻件活塞杆进行了研究。结果表明,裂纹附近有严重的脱碳层和氧化颗粒,断口呈暗灰色。因此该裂纹为锻造折叠所引起。同时观察锻造后未调质的金相组织,晶粒粗大且不均匀。因此,锻后应进行正火处理,细化晶粒,减少调质中产品开裂倾向。
The 45 steel forged piston rod with crack was studied by means of chemical composition, metallographic microscope, SEM and EDS analysis. The results show that there are the serious decarburization layer and oxide particles around the crack, and the fracture was dark gray. Wherefore, the crack is caused by the fold flaw during forging. At the same time, the microstructure was observed without quenching and tempering, the grains were bigger and inhomogeneous. The normalizing process should be arranged after forging, which would refine the grains and reduce the tendency to heat-treatment crack of production.
出处
《热加工工艺》
CSCD
北大核心
2013年第1期224-226,共3页
Hot Working Technology
关键词
裂纹
组织分析
力学性能
45钢
crack
microstructure analysis
mechanical property
45 steel
