低碳Mn-Mo-Nb-B鋼奧氏體晶粒長大傾向性試驗(yàn)研究

Experimental Research on Enlargement Tendency of Austenite Gain in Low-carbon Mn-Mo-Nb-B Series Steels

摘要: 研究了低碳Mn-Mo-Nb-B系鋼的韌化方向和韌性控制因素中所涉及的主要問題——原始晶?？刂啤Ｑ芯勘砻?在1250℃左右的加熱溫度,5min/mm的保溫時(shí)間內(nèi),鋼的奧氏體晶粒仍然保持在50μm左右,為奧氏體的再結(jié)晶軋制提供了良好的奧氏體晶粒度,但當(dāng)加熱溫度高于1250℃后,出現(xiàn)晶粒急驟長大現(xiàn)象。本試驗(yàn)為該類鋼制定更合理的加熱制度提供了參考。

Abstract: Studied is the major element among those concerning control of the toughening orientation and toughness of the low-carbon Mn-Mo-Nb-B series steels, i.e., the control of the primitive gains.The result shows that with heating temperature of about 1 250℃ and holding time of 5 min/mm, the austenite grain size still remains as about 50 μm, a very appropriate grain size for austenitic recrystallisation-rolling, and that nevertheless, in case of temperature above 1 250℃, the grain size shall become bigger rapidly.This conclusion can be used as reference basis for establishing more logic heating schedule for steels of the above mentioned category.