形变温度和冷却方式对中碳钢显微组织及拉拔性能的影响  

EFFECT OF DEFORMATION TEMPERATURE AND COOLING WAY ON THE MICROSTRUCTURE AND DRAWING PROPERTY OF MEDIUM CARBON STEEL

作　　者：田新中 

机构地区：[1]邢台钢铁有限责任公司,河北省线材工程技术研究中心,河北邢台054027

出　　处：《河北冶金》2017年第6期1-7,共7页Hebei Metallurgy

摘　　要：采用Gleeble热模拟试验机研究了形变温度及冷却速度对ML35钢显微组织与硬度的影响;对比分析了10B21钢SM控冷盘条和板链式控冷盘条的显微组织差异,用Minitab软件统计分析了显微组织对盘条拉拔性能的影响。结果表明:当ML35钢形变温度为750℃时晶粒明显细化,部分珠光体发生退化,渗碳体呈短棒状或颗粒状,但硬度相对偏高;降低形变后的冷却速度可粗化晶粒,降低硬度;粗大的铁素体+珠光体组织比细小的铁素体+珠光体组织具有较高的初始加工硬化率;并且在初始变形过程中,具有相对粗大的铁素体+珠光体组织盘条的断后伸长率下降偏快。The effect on microstructure and hardness of ML35 medium carbon steel of different deformation temperatures and cooling ways were studied with Gleeble thermal simulation testing machine. The microstruc- ture of 10B21 steel wire bar produced by SM controlled cooling way and plate chain controlled cooling way was contrasted. The effect of microstructure on the drawing property was analyzed by Minitab software. The results show that when the deformation temperature of ML35 steel is 750 ℃, the grains were obviously re- fined, some pearlite degenerated, and the cementite presents the shape of rod or particle, but the hardness is relatively high; reducing the cooling rate after deformation can coarse grain and reduce hardness. The initial work hardening rate of coarse ferrite and pearlite is higher than that of finer ferrite and pearlite. The elonga- tion of steel with coarse ferrite and pearlite decreased faster in the initial deformation.

关 键 词：形变温度 冷却方式 中碳钢 显微组织 拉拔性能 影响 

分 类 号：TG335.1[金属学及工艺—金属压力加工]