正火处理对建筑用20MnSiV钢组织与力学性能的影响  

Effects of Normalizing Treatment on Microstructure and Mechanical Properties of 20MnSiV Steel for Building

作　　者：袁棪[1] 梁盼[1] YUAN Yan;LIANG Pan(School of Civil Engineering,Zhengzhou University of Science&Technology,Zhengzhou 450064,China)

机构地区：[1]郑州科技学院土木建筑工程学院,河南郑州450064

出　　处：《热加工工艺》2020年第16期146-148,共3页Hot Working Technology

基　　金：河南省高等学校重点科研项目(19B560010)。

摘　　要：通过光学显微镜(OM)、扫描电镜(SEM)、拉伸试验机、冲击试验机等手段研究了不同温度正火处理对20MnSiV钢显微组织与力学性能的影响。结果表明:热轧态20MnSiV试验钢显微组织由板条状、针状铁素体和珠光体组成。在850~920℃,随着正火温度的升高,试验钢组织中的条状、针状铁素体逐渐减少,晶粒呈等轴趋势变化并逐渐细化,组织均匀性逐渐提高。960℃正火试样晶粒明显长大粗化。在850~960℃,随着正火温度的升高,试验钢强度先降低后升高,伸长率先升高后降低,低温冲击吸收能量先升高后降低。880℃正火试样-20℃低温冲击吸收能量达到58J,比热轧态试样的提升了222%,正火处理对20MnSiV钢的低温冲击韧性改善最为显著。The effects of normalizing treatment at different temperatures on the microstructure and mechanical properties of 20 MnSiV steel were studied by means of optical microscope(OM), scanning electron microscope(SEM), tensile tester and impact tester. The results show that, the microstructure of hot rolled 20 MnSiV test steel is composed of strip, acicular ferrite and pearlite. At 850-920 ℃, with the increase of normalizing temperature, the strip and needle-like ferrite in the microstructure of the test steel gradually decrease, the grains shovo an a equiaxed trend and are refined gradually, and the microstructure uniformity increases gradually. The grain size of normalizing sample at 960 ℃ is obviously grown and coarsened. At 850-960 ℃, with the increase of the normalizing temperature, the strength of the test steel is decreased firstly,then the elongation is decreased, and the low-temperature impact absorption energy is first raised and then decreased. The impact absorption energy of the sample normalizing at 880 ℃ at-20 ℃ low temperature reaches 58 J, which is 222% higher than that of the hot rolled sample. Normalizing treatment has the most significant effect on the low temperature impact toughness of 20 MnSiV steel.

关 键 词：20MnSiV钢 正火 组织 低温冲击韧性 

分 类 号：TG156.4[金属学及工艺—热处理] TG161[金属学及工艺—金属学]