模拟正火温度对Q355E钢锻件组织和性能的影响  

Effect of simulated normalizing temperature on microstructure and properties of Q355E steel forgings

作　　者：何春静 庞庆海 李洁 殷立涛 聂新林 He Chunjing;Pang Qinghai;Li Jie;Yin Litao;Nie Xinlin(Luoyang CITIC HIC Casting&Forging Co.,Ltd.,Luoyang Henan 471039,China;State Key Laboratory of Mining Heavy Equipment,Luoyang Henan 471039,China;Luoyang Large Casting and Forging Material Enterprise Research and Development Center,Luoyang Henan 471039,China)

机构地区：[1]洛阳中重铸锻有限责任公司,河南洛阳471039 [2]矿山重型装备国家重点实验室,河南洛阳471039 [3]洛阳市大型铸锻件材料企业研发中心,河南洛阳471039

出　　处：《金属热处理》2022年第6期123-127,共5页Heat Treatment of Metals

基　　金：国家重点研发计划(2020YFB2008400)。

摘　　要：利用模拟程控热处理炉进行300 mm×300 mm截面Q355E钢锻件心部材料的模拟正火处理试验,通过光学显微镜、扫描电镜、拉伸和冲击试验机,研究模拟正火温度对厚截面风电法兰用Q355E钢锻件组织和性能的影响。结果表明,模拟正火温度由780℃升高至900℃,并经580℃回火后,材料-50℃冲击吸收能量呈现先增加后降低的趋势,铁素体平均尺寸由14.73μm降低至12.07μm又增大至15.02μm,珠光体的平均尺寸从3.69μm增大至10.51μm;模拟正火温度为820℃和840℃时,铁素体和珠光体组织均匀细小,珠光体呈条状和近等轴状分布,-50℃冲击吸收能量为183.8~211.1 J,试样剪切断面率在50%以上。对于300 mm×300 mm截面Q355E钢锻件,可选择820~840℃正火处理,以获得优良稳定的低温冲击吸收能量。Simulated normalizing treatment of the center material of a 300 mm×300 mm section Q355 E steel forging was carried out by using a simulated program-controlled heat treatment furnace. Effect of simulated normalizing temperature on the microstructure and properties of Q355 E steel forgms for thick section wind-electron flange was studied by optical microscope, scanning electron microscope, tensile and impact testing machines. The results show that with the increase of simulated normalizing temperature in range of 780-900 ℃ and then tempered at 580 ℃, the impact absorbed energy at-50 ℃ of the specimens increases first and then decreases, and the average size of ferrite decreases from 14.73 μm to 12.07 μm and then increases to 15.02 μm, and the average size of pearlite increases from 3.69 μm to 10.51 μm. When the simulated heat treatment temperature is 820 ℃ and 840 ℃, the microstructure of ferrite and pearlite is uniform and fine, and pearlite is distributed in strip and near equiaxed shape, the impact absorbed energy at-50 ℃ is 183.8 J to 211.1 J, and the shear section ratio of the specimens is more than 50%. For 300 mm×300 mm section Q355 E steel forgings, normalizing treatment at 820-840 ℃ can be selected to obtain excellent and stable low temperature impact absorbed energy.

关 键 词：Q355E钢 模拟正火处理 低温韧性 显微组织 厚截面锻件 

分 类 号：TG142.33[一般工业技术—材料科学与工程]