Nb对H13钢组织及冲击性能的影响  

Effect of Nb on microstructure and impact properties of H13 steel

作　　者：欧阳伟豪 周健[2] 高鹏[1] 林鹏 迟宏宵[2] 王文军 Ouyang Weihao;Zhou Jian;Gao Peng;Lin Peng;Chi Hongxiao;Wang Wenjun(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Research Institute of Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China;Hebei Institute of Mechanical and Electrical Technology,Xingtai Hebei 054000,China;CITIC Metal Co.,Ltd.,Beijing 100004,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院特殊钢研究所,北京100081 [3]河北机电职业技术学院,河北邢台054000 [4]中信金属股份有限公司,北京100004

出　　处：《金属热处理》2021年第12期24-30,共7页Heat Treatment of Metals

基　　金：中信铌钢发展奖励基金。

摘　　要：采用OM、SEM、EDS、相分析、硬度测试和冲击性能试验等分析手段,对比研究Nb含量为0、0.067%和0.270%(质量分数)的H13试验钢淬回火后的组织及力学性能。结果表明,加入Nb后试验钢淬火硬度有所下降;淬火温度提高后,含Nb试验钢的晶粒尺寸小于0Nb试验钢,但含Nb试验钢中存在部分未溶碳化物;3种试验钢回火后的二次硬化峰均出现在510℃。经1050℃淬火、不同温度回火后,0.067Nb试验钢的冲击吸收能量高于0Nb试验钢。0.27Nb试验钢受到大尺寸碳化物的影响,淬火温度在1080℃以下时,冲击吸收能量不及另两种试验钢。Microstructure and mechanical properties of the H13 tested steel with Nb content of 0, 0.067% and 0.270%(mass fraction) after quenching and tempering were comparatively studied by means of OM, SEM, EDS, phase analysis, hardness test and impact properties test. The results show that quenching hardness of the tested steel decreases after adding Nb. As the quenching temperature increases, the grain size of the Nb-containing tested steels is smaller than that of the 0 Nb tested steel, but there are some undissolved carbides in the Nb-containing tested steels. The secondary hardening peak of the three tested steels after tempering all appear at 510 ℃. After quenching at 1050 ℃ and tempering at different temperatures, the impact absorbed energy of the 0.067 Nb tested steel is higher than that of the 0 Nb tested steel. Due to the influence of large-size carbides, when the quenching temperature is below 1080 ℃, the impact absorbed energy of the 0.27 Nb tested steel is not as good as that of the other two tested steels.

关 键 词：NB H13钢 晶粒度 冲击吸收能量 碳化物 

分 类 号：TG142.1[一般工业技术—材料科学与工程]