亚温淬火对硼镍添加含铌低合金高强度H型钢组织性能的影响  

Effect of Subcritical Quenching on Microstructures and Mechanical Properties of Boron-nickel Added Nb-treated HSLA H-beam

作　　者：王晓[1] 王作成[1] 王协彬[1] 李显达[1] 高俊庆 赵修领 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061 [2]莱芜钢铁股份有限公司,山东莱芜271104

出　　处：《材料工程》2012年第3期22-27,共6页Journal of Materials Engineering

摘　　要：将硼镍添加的含铌低合金高强度H型钢进行亚温淬火及完全淬火,对淬火以及淬火并高温回火后的试样进行了力学性能和微观组织的研究。结果表明:亚温淬火并回火后,这一新钢种的屈服强度达到512MPa,抗拉强度达到595MPa,伸长率达到27%,韧脆转变温度达到-88℃,具有优异的综合力学性能。近似等轴的铁素体及其上弥散分布的细小碳化物,使得回火时塑性大幅提高而强度下降不多;回火碳化物钉扎晶界,抑制了晶粒的长大,起到了细化晶粒的效果;不连续的细小碳化物分布在晶界上,没有对材料的韧性造成破坏。Microstructures and mechanical properties of subcritical/complete quenched and quenched tempered boron-nickel added Nb-treated high strength low alloy（HSLA） H-beams were investigated.The results indicate that the subcritical quenched and tempered steel exhibits good combination of strength,plasticity and toughness.Yield strength,tensile strength and elongation of the subcritical quenched and tempered steel is 512MPa,595MPa and 27%,respectively.Its ductile-brittle transition temperature is-88℃.The quasi-polygonal ferrite and dispersed small carbides make sure high plasticity without dramatic decrease of strength after tempering.The carbides promote grain refinement by pinning effect and have little influence on toughness.

关 键 词：低合金高强度H型钢 亚温淬火 微观组织 力学性能 

分 类 号：TG161[金属学及工艺—热处理]