摘要
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。
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 temperature, irrational cooling rate of normalizing after forging and insufficient content of alloy elements in steel causes the formation of this structure. The unqualified forgings are remedied by the means of multiple normalizing to remove widmanstatten structures. The qualified forgings are guaranteed by adjusting steel composition, reducing the final forging temperature and increasing cooling rate of normalizing in succeeding production.
出处
《大型铸锻件》
2013年第1期30-32,36,共4页
Heavy Casting and Forging
关键词
20钢
屈服强度
冲击韧性
魏氏组织
正火
20 steel
yield strength
impact toughness
widmannstatten structure
normalizing
