低碳490MPa级铆螺钢控轧控冷的研究  

Study of Controlled Rolling and Cooling of 490MPa Grade Low Carbon Cold Heading Steel

作　　者：吴迪[1] 李壮[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004

出　　处：《钢铁》2008年第4期61-65,共5页Iron and Steel

基　　金：国家自然科学基金资助项目(50334010)

摘　　要：通过控轧控冷试验,研究了不同工艺参数对ML15钢力学性能的影响。结果表明,由于应变诱导铁素体相变,铁素体晶粒细化,低温轧制较常规轧制后快速冷却可以获得更好的综合力学性能;常规轧制后快速冷却要优于低温轧制后慢冷试样的力学性能;终冷温度越低,珠光体片间距越细,强度和塑性越好;低碳铆螺钢采用控轧控冷不经热处理抗拉强度达到490 MPa级别,其力学性能远优于常规轧制后不控冷的同样试样。Effects of technological parameters of controlled rolling and controlled cooling on the mechanical properties of ML15 steel were investigated. The results showed that good mechanical properties could be obtained by low temperature rolling compared with conventional methods （rapid cooling after rolling）, because the deformation induced ferrite transformation is occurred during deformation and the ferrite grains are refined. The mechanical properties of the specimens （rapid cooled after conventional rolling） are better than that of slow cooled after low temperature rolling. The lower finish cooling temperature, the shorter interlamellar spacing in pearlite colonies and the higher tensile strength and ductility are. The mechanical properties of the low carbon ML15 bars produced by controlled rolling and controlled cooling without heat treatment of which tensile strength reaches 490 MPa are superior than that produced by conventional rolling without controlled cooling.

关 键 词：低碳铆螺钢 控轧控冷 晶粒细化 力学性能 

分 类 号：TG335[金属学及工艺—金属压力加工]