不同两相区淬火温度对9Ni钢组织与性能的影响  

Effect of different intercritical quenching temperature on microstructure and properties of 9Ni Steel

作　　者：李荣斌 秦品强[1] 陈永强 李珂 龙文宇 Li Rongbin;Qin Pinqiang;Chen Yongqiang;Li Ke;Long Wenyong(Academy of Material Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Academy of Materials,Shanghai Dianji University,Shanghai 201306,China;Shanghai Engineering Research Center of Large Piece Hot Manufacturing,Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]上海理工大学材料科学与工程学院,上海200093 [2]上海电机学院材料学院,上海201306 [3]上海电机学院上海大件热制造工程技术研究中心,上海201306

出　　处：《金属热处理》2021年第7期18-22,共5页Heat Treatment of Metals

基　　金：上海市大件热制造工程技术中心项目(18DZ253400);临港新片区高新产业和科技创新专项项目(SH-LG-GK-2020-28);上海市地方院校能力建设项目(21010500900)。

摘　　要：通过SEM、XRD、疲劳试验机、冲击试验机等分析了620~680℃区间不同两相区淬火温度对9Ni钢强度和低温冲击性能的影响。结果表明,回转奥氏体含量和稳定性对材料性能影响显著,随着两相区淬火温度的升高,9Ni钢抗拉强度不断增大,而低温冲击性能呈现先升高后降低的非线性趋势。在640℃时,试样的回转奥氏体含量最高,达9.65%;断后伸长率最高,达到32.67%;冲击吸收能量最高,常温下达到332.83 J,-196℃条件下为297.69 J,总体展现出良好的强韧性。Effects of different intercritical quenching temperatures in the range of 620-680℃on the strength and low temperature impact property of 9Ni steel were analyzed by means of SEM,XRD,fatigue testing machine,and impact testing machine.The results show that the content and stability of reversed austenite have a significant effect on the material properties.With the increase of intercritical quenching temperature,the tensile strength of the steel continues to increase,while the low temperature impact property presents a nonlinear trend of first increasing and then decreasing.When the intercritical quenching temperature is 640℃,the reversed austenite content,the elongation after fracture,the impact absorbed energy of the specimens all are the highest,respectively being 9.65%,32.67%,332.83 J at room temperature and 297.69 J at-196℃,showing the best match of strength and toughness on the whole.

关 键 词：9NI钢 两相区淬火温度 微观组织 回转奥氏体 力学性能 

分 类 号：TG142.79[一般工业技术—材料科学与工程]