淬火-碳分配-回火工艺对中碳贝氏体钢应变硬化行为的影响  

Effect of quenching-partitioning-temperingprocess on strain hardening behavior of medium carbon bainitic steel

作　　者：李万东 LI Wandong(Hebei Petroleum University of Technology,Chengde 067000,Hebei,China)

机构地区：[1]河北石油职业技术大学,河北承德067000

出　　处：《四川冶金》2021年第5期33-36,共4页Sichuan Metallurgy

摘　　要：为了研究中碳贝氏体钢的应变硬化行为的影响因素,本文借助扫描电子显微镜(SEM)、万能拉伸试验测试等手段观察分析了不同热处理状态中碳贝氏体钢的显微组织和拉伸力学性能,并且通过公式计算得出了试验钢的不同应变硬化指数(n)。结果表明,淬火-回火处理后,回火温度低于500℃,试验钢的n值随着回火温度升高而增加;经过淬火-碳分配-回火(Q-P-T)工艺处理的试验钢的n值大于空冷/油冷处理过的试样钢的n值,甚至比回火处理的n值大,且随着碳分配时间延长n值呈上升趋势;拉伸过程中,Q-P-T工艺处理后的中碳贝氏体钢具有较强的抵抗偶然过载的能力,更容易产生均匀变形,具有较优异的塑性和韧性。In order to research the influencing factors of the strain hardening behavior of medium carbon bainitic steel,scanning electron microscope(SEM),universal tensile test and other methods were used on analysing the microstructure and mechanical properties of medium carbon bainitic steel in different heat treatment states.The strain hardening index(n)of the investigated steel is calculated by formula from the tensile experiments data.The results show that the n value of the test steel increases with the increase of tempering temperature when the tempering temperature is lower than 500℃.And the n value of the test steel processed by the quenching-partitioning-tempering process is larger than that of the air-cooled or oil-cooled sample.And the n value of steel is even larger than the value of tempering treated steel.The n value also shows an increasing trend with the carbon partitioning time increasing.This research indicates that the Q-P-T process sample has a strong ability to resist accidental overload during the tensile process,which provides an excellent plasticity and toughness property for medium carbon bainitic steel.

关 键 词：中碳钢 热处理工艺 拉伸性能 应变硬化指数 

分 类 号：TG161[金属学及工艺—热处理]