本文選題：Q + 工程機械用鋼��； 參考：《熱加工工藝》2015年24期

【摘要】：以Q550高強度工程機械用鋼為研究對象,研究了該鋼種的加工工藝對其晶粒及組織的影響。結果表明,在試樣變形過程中存在著兩種應力-應變狀態(tài),其中一種是動態(tài)再結晶型的,另外一種是動態(tài)回復型的。當冷卻速度變大時,材料組織結構中貝氏體的晶粒粒徑減小,同時貝氏體鐵素體間距變小,此時材料的硬度先增大后減小。當冷卻速率為30℃/s時,試樣的維氏硬度達到最大值346 HV。為了獲得力學性能較好的鋼材,避免混晶的出現(xiàn),Q550高強鋼的終軋溫度應在900℃以下。
[Abstract]:The effect of processing technology on the grain and microstructure of Q550 high strength construction machinery steel was studied. The results show that there are two kinds of stress-strain states during the deformation of the specimen, one of which is dynamic recrystallization and the other is dynamic recovery. With the increase of cooling rate, the grain size of bainite and the spacing of bainite ferrite decrease, and the hardness of bainite increases first and then decreases. When the cooling rate is 30 鈩，

本文編號：1865753