正火工艺对12Cr1MoV合金结构钢组织性能的影响  

Effects of Normalizing Process on Microstructure and Properties of 12Cr1MoV Alloy Structural Steel

作　　者：冯丹竹 隋轶[2] 张宏亮 黄健 Feng Danzhu;Sui Yi;Zhang Hongliang;Huang Jian(Iron and Steel Research Institute of Angang Group;Medium Plate Division of Angang Steel Company Limited)

机构地区：[1]鞍钢集团钢铁研究院 [2]鞍钢股份有限公司中厚板事业部

出　　处：《宽厚板》2022年第1期1-5,共5页Wide and Heavy Plate

摘　　要：针对不同正火温度和保温时间对12Cr1MoV合金结构钢组织及力学性能的影响展开研究,结果表明:试验钢经过不同温度正火处理获得铁素体、珠光体和贝氏体组织。随着正火温度的升高,粒状贝氏体逐渐增多且粗大化,聚集在心部形成贝氏体条带,强度随着正火温度的升高而增大,延伸率和冲击韧性均随着正火温度的升高而逐渐降低;随着正火保温时间的延长,偏析区域聚集的合金元素扩散至两侧,改善了中心偏析,同时贝氏体含量增加,强度升高、位错密度降低及贝氏体粗大化综合作用,使试验钢的延伸率和冲击韧性先升高、后降低;试验钢经过920℃正火、120 min保温处理,抗拉强度、屈服强度、延伸率、冲击功分别达到522 MPa、293 MPa、31.5%、184 J,其综合力学性能最佳。The effects of different normalizing temperatures and holding time on the microstructure and mechanical properties of 12 Cr1 MoV alloy steel are studied.The results show that the microstructure of the test steel is ferrite, pearlite and bainite at different normalizing temperatures.With the increase of normalizing temperature, the granular bainite gradually increases, coarsens and accumulates at the center to form bainite bands.The strength increases with the increase of normalizing temperature, and the elongation ratio and impact toughness decrease with the increase of normalizing temperature.With the extension of normalizing and holding time, the alloy elements aggregated in the segregation region can diffuse to both sides, which improves the central segregation and increases the bainite content.The comprehensive effects of strength increasing, dislocation density decreasing and bainite coarsening enable the elongation ratio and impact toughness increasing initially and decreasing later for the test steel.The tensile strength, yield strength, elongation ratio and impact absorbed energy value of the steel can reach to 522 MPa, 293 MPa, 31.5% and 184 J respectively after normalizing at 920 ℃ and holding for 120 min, which shows an optimum comprehensive mechanical properties.

关 键 词：正火工艺 结构钢 显微组织 力学性能 

分 类 号：TG156.4[金属学及工艺—热处理] TG142.41[金属学及工艺—金属学]