CAJ | 학술논문

对20钢不合格锻件进行研究,确定屈服强度和冲击韧性不合格的直接原因是锻件内部存在大量的粗大魏氏组织.该组织的形成原因主要是锻件终锻温度过高,锻后正火冷却速度不合理,并且钢中合金元素含量偏低.通过多次正火消除了魏氏组织,使不合格锻件得以挽救,并在后续生产中调整钢的成分、降低终锻温度、提高正火冷却速度确保了锻件一次合格.
대20강불합격단건진행연구,학정굴복강도화충격인성불합격적직접원인시단건내부존재대량적조대위씨조직.해조직적형성원인주요시단건종단온도과고,단후정화냉각속도불합리,병차강중합금원소함량편저.통과다차정화소제료위씨조직,사불합격단건득이만구,병재후속생산중조정강적성분、강저종단온도、제고정화냉각속도학보료단건일차합격.
The unqualified 20 steel forgings are researched to confirm a lot of rough widmanstatten structures are the direct element resulting in the failure of yield strength and impact toughness .The too high final forging tempera-ture, irrational cooling rate of normalizing after forging and insufficient content of alloy elements in steel causes the for -mation of this structure.The unqualified forgings are remedied by the means of multiple normalizing to remove widma -nstatten structures.The qualified forgings are guaranteed by adjusting steel composition , reducing the final forging tem-perature and increasing cooling rate of normalizing in succeeding production .