摘要
通过钒氮微合金化,在转炉CSP生产线上开发了超细晶、高韧性API-X60管线钢,通过实验研究了X60的组织、性能,探讨了X60的强化机制。结果表明,X60的金相组织由多边形铁素体和微量珠光体组成,铁素体晶粒尺寸细化到了5μm以下。CSP流程存在V(C,N)析出不充分的现象。X60的主要强化机制为细晶强化,另外,V(C,N)沉淀强化产生的强度增量约为60 MPa,纳米夹杂析出物产生的强度增量约为40 MPa。
The microstructure and mechanical properties of vanadium-nitrogen（V-N） microalloyed API-X60 pipeline steel（X60） with ultrafine grain and high toughness developed by converter steelmaking-compact strip production （CSP） line were studied to investigate the strengthening mechanism. The results show that the microstructure of the X60 is composed of polygonal ferrite and micro pearlite, the mean size of ferrite grains is less than 5μm. It was observed that V（C, N） could not precipitate sufficiently in CSP process. The main strengthening mechanism of X60 is grain refining strengthening. The yield strength （YS） increases due to precipitation strengthening of V（C,N） and nono-sized inclusion by about 60 MPa and 40 MPa respectively.
出处
《钢铁》
CAS
CSCD
北大核心
2006年第9期73-77,共5页
Iron and Steel
关键词
:CSP
V-N
超细晶
管线钢
强化机理
CSP
V-N
untrafine grain, pipeline steel
strengthening mechanism
