铌-钛微合金化0.36C-0.83Ni-1.2Cr-0.23Mo超高强度淬火-210 ℃回火马氏体钢组织与性能  

Microstructure and Properties of Nb-Ti Microalloyed Ultra-High-Strength Quenching-210℃Tempering Martensitic Steel 0.36C-0.83Ni-1.2Cr-0.23Mo

作　　者：杨晰 苏春霞[1,2] 陈本文 李福坤[1,2] 高山 李培兴[3] Yang Xi;Su Chunxia;Chen Benwen;Li Fukun;Gao Shan;Li Peixing(State Key Laboratory of Metallic Material for Marine Equipment and Application,Anshan 114009;Technology Center of Angang Steel Co Ltd,Anshan 114009;Production Department of Angang Steel Co Ltd,Anshan 114009)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,鞍山114009 [2]鞍钢股份有限公司技术中心,鞍山114009 [3]鞍钢股份有限公司制造管理部,鞍山114009

出　　处：《特殊钢》2022年第2期79-81,共3页Special Steel

摘　　要：利用拉伸试验机、冲击试验机、光学显微镜、透射电镜等研究了Ni-Ti微合金化超高强度钢(/%:0.36C,0.45Si,0.63Mn,0.005P,0.002S,0.83Ni,1.2Cr,0.23Mo,0.04Nb,0.01Ti,0.0040 N,0.0020 O)的组织与性能。200 kg真空感应炉冶炼的试验钢开轧温度1050℃、终轧温度850℃,轧态组织以贝氏体和珠光体为主。经890℃淬火+210℃低温回火后,钢的R_(m) 1906 MPa,R_(p0.2)1574 MPa,A10.0%和-40℃K V218 J;组织中除含有少量两端呈方形的板条马氏体外,多为两端呈尖角的针状马氏体,大部分与晶界夹角呈60°,其亚结构出现较多孪晶,组织中微合金化析出物主要为尺寸较小的圆形或椭圆形NbC,以及少量尺寸较大的呈方形与圆形复合形态的析出物(Ti,Nb)(C,N),可以看出复合析出物尺寸越大、方形特征越明显,析出相中Nb含量降低,Ti含量升高。Microstructure and properties of Nb-Ti microalloyed ultra-high-strength steel(/%:0.36C,0.45Si,0.63Mn,0.005P,0.002S,0.83Ni,1.2Cr,0.23Mo,0.04Nb,0.01Ti,0.0040 N,0.0020 O)are studied by tensile tester,impact tester,metallographic microscope,transmission electron microscopy and other equipments.Of 200 kg VIM furnace melting with initial rolling at 1050℃and finshing rolled at 850℃,the test steel organization mainly structure is bainite and pearlite.After quenching at 890℃and tempering at 210℃,the mechanical properties of steel are R_(m) 1906 MPa,R_(p0.2)1574 MPa,A 10.0%and-40℃K V218 J,the organization has a small amount of lath martensite with both ends of a square,in addition to a mass of acicular martensite with both ends of sharp-angled,mostly with grain boundary angle in 60°,and its substructure appears a large number of twin,accompanied by microalloyed precipitates;the microalloyed precipitates are mainly round or oval small size NbC.And a small amount of square and circular larger size(Ti,Nb)(C,N)precipitates.the greater size,the more obvious square characteristics,and the niobium content of precipitate phase reduces,the titanium content increases.

关 键 词：超高强钢 调质力学性能 铌-钛微合金化 析出物 

分 类 号：TG142.24[一般工业技术—材料科学与工程]