45CrNiMoV钢铸坯的高温塑性研究及应用  

STUDY AND APPLICATION OF HIGH TEMPERATURE PLASTICITY OF 45CRNIMOV STEEL CASTING BILLET

作　　者：刘涛[1] 吕瑞国[1] 唐小勇[1] 周启航 喻建林 Liu Tao;Lyu Ruiguo;Tang Xiaoyong;Zhou Qihang;Yu Jianin(Xinyu Iron and Steel Group Co.,Ltd.)

机构地区：[1]新余钢铁集团有限公司,江西新余338006

出　　处：《河南冶金》2024年第4期42-47,共6页Henan Metallurgy

摘　　要：采用Gleeble-3800热模拟试验机对45CrNiMoV钢铸坯在600~1 300℃温度范围内进行高温力学性能试验,同时利用光学显微镜、扫描电镜对基体组织和断口形貌进行观察和分析,得出不同温度区间的断裂机理。结果表明:在1×10^(-3)s^(-1)的应变速率下,45CrNiMoV钢铸坯第Ⅰ高温脆性区为1 143~1 300℃,试样断口平齐光滑,为脆性断裂;高温塑性区为889~1 143℃,断口具有明显韧窝特征,为韧性断裂;第Ⅲ低温脆性区为600~889℃,断口属于典型的沿晶脆性断裂。根据高温力学性能研究结果,将连铸坯矫直温度控制在高温塑性区时,铸坯无表面和中心裂纹等缺陷,铸坯质量良好。The Gleeble-3800 thermal simulation testing machine was used to conduct high-temperature mechanical property tests on 45CrNiMoV steel casting billet in the temperature range of 600~1300℃.At the same time,optical microscopy and scanning electron microscopy were used to observe and analyze the matrix structure and fracture morphology,and thefracturemechanim indiferenttemperatureranges was obtained.Theresults show thatatastrainrateofo'the first high-temperature britle zone of 45CrNiMoV steel billet is 1143~1300℃,and the fracture surface of the sample is flat and smooth,indicating britle fracture;889~1143℃ is the high-temperature plastic zone,with obvious ductile dimples on the fracture surface,indicating ductile fracture;the third low-temperature brittle zone is 600~889℃,the fracture surface belongs to a typical transgranular brittle fracture.According to the research results of high-temperature mechanical properties,when the straightening temperature of the continuous casting billet is controlled in the high-temperature plastic zone,there are no defects such as surface and center cracks in the billet,and the quality of the billet is good.

关 键 词：45CrNiMoV 高温塑性 脆性温度 铸坯 

分 类 号：TF777[冶金工程—钢铁冶金]