摘要
利用直读光谱对S48C钢锻件缺陷样品的化学成分进行了分析。使用金相显微镜及扫描电镜对缺陷样品进行了显微组织及断口检验,并对缺陷样品重新热处理。结果表明:孔洞、裂纹、晶粒粗大、晶界熔化缺陷是加热温度过高造成的,它弱化钢坯晶界,降低延性和韧性,从而导致锻造开裂。
Chemical composition of the defective sample of $48C steel forgings was analyzed by the direct reading spectrometer. Microstructure and fracture were inspected by the metallographic and SEM. And then re-heat treatment experiments were performed. The results demonstrate that defects--void, the crack, coarse grains, melting of the grain boundary are caused by exorbitant heating temperature, which weakens the grain boundary, reduces the ductility and toughness of the billet, and leads to forging crack.
出处
《热加工工艺》
CSCD
北大核心
2013年第23期203-206,共4页
Hot Working Technology
关键词
硫化物
氧化质点
熔化
过烧
sulfide
oxidation particle
melting
overburning
