高碳合金钢75Cr1热变形行为研究
发布时间：2018-08-29 07:46
【摘要】：随着我国建筑,矿山等领域的快速发展,国内目前对锯片钢的需求量很大,尤其在精密切割设备上使用的锯片钢,长期需要进口,而最早研发的钢种50Mn2V已经难以满足国内市场进一步发展的需要,研发一种新型的、性能更优异的锯片钢成为众多企业迫切的需要。高碳合金钢75Cr1钢以其高硬度、高弹性及优异的淬透性及耐磨性成为高端锯片钢最新的代表。本文使用Gleeble-1500D热模拟试验机对试验材料进行单道次热变形试验,并通过SEM、金相显微镜等设备,研究影响变形抗力等因素,研究结果表明:变形温度越低、应变速率越大,试验钢75Cr1的应力应变曲线则越容易呈现动态再结晶类型曲线;反之,则呈现加工硬化类型应力应变曲线。通过保温加热实验研究75Cr1钢的奥氏体晶粒长大行为,经对比得到的实验结果发现:晶粒的长大速率随温度升高先增加后趋于平缓,并结合Sellars提出的C-Mn钢晶粒长大模型,计算晶粒长大激活能Q=1.57×106J/mol,进一步推导出75Cr1钢的晶粒长大模型根据Tegart提出的双曲正弦函数,并应用线性回归方法,推算试验钢75Cr1的热变形激活能Qd=264.4KJ/mol,以此计算出75Cr1钢的热变形方程:E=9.43*10~(-3)[sinh(010105σ)]~(3.24)exp(264.4/RT)基于存储能演化规律,并通过拟合原有热变形实验数据,准确定位应力应变曲线上的临界回复/动态再结晶点。并以演化规律为基础,构思一种新的方法计算75Cr1钢的动态再结晶分数XD。此构思可以较好的解决对于求取无明显峰值应力应变曲线上再结晶体积分数存在的困难,但在实际应用中的准确度仍需讨论。综上建立的有关75Cr1钢的奥氏体晶粒长大模型、热变形模型、动态再结晶及流变应力等模型,可以进一步成为研发75Cr1钢组织性能预报软件中的基础物理冶金模型。
[Abstract]:With the rapid development of construction, mining and other fields in our country, the domestic demand for saw blade steel is very large, especially the saw blade steel used in precision cutting equipment, which needs to be imported for a long time. The earliest developed steel 50Mn2V has been difficult to meet the needs of the further development of the domestic market, the development of a new type of saw blade steel with better performance has become the urgent need of many enterprises. High carbon alloy steel 75Cr1 steel with high hardness, high elasticity and excellent hardenability and wear resistance has become the newest representative of high end saw blade steel. In this paper, the single pass thermal deformation test of the test material was carried out with Gleeble-1500D thermal simulator, and the influence factors such as deformation resistance were studied by means of SEM, metallographic microscope and other equipment. The results showed that the lower the deformation temperature, the greater the strain rate. The stress-strain curve of test steel 75Cr1 is easier to show dynamic recrystallization type curve, and conversely, the stress-strain curve of work hardening type. The austenitic grain growth behavior of 75Cr1 steel was studied by heat preservation experiment. The results showed that the grain growth rate increased first with the increase of temperature and then tended to be smooth, and combined with the model of grain growth of C-Mn steel proposed by Sellars, the austenite grain growth behavior of 75Cr1 steel was studied. The activation energy of grain growth Q1. 57 脳 10 6 J / mol was calculated, and the grain growth model of 75Cr1 steel was derived according to the hyperbolic sinusoidal function proposed by Tegart, and the linear regression method was applied. The thermal deformation activation energy (Qd=264.4KJ/mol,) of test steel 75Cr1 is calculated by calculating the thermal deformation equation of 75Cr1 steel: E9.4310-3 [sinh (010105 蟽)] 3.24) exp (264.4/RT based on the evolution of storage energy, and by fitting the original experimental data of thermal deformation, the critical recovery / dynamic recrystallization point on the stress-strain curve is accurately located. Based on the evolution law, a new method for calculating dynamic recrystallization fraction XD. of 75Cr1 steel was proposed. This idea can solve the difficulty of calculating the integral number of recrystallized volume on the stress-strain curve without obvious peak value, but the accuracy in practical application still needs to be discussed. The austenitic grain growth model, hot deformation model, dynamic recrystallization model and rheological stress model of 75Cr1 steel can be further developed as the basic physical metallurgical model in the research and development of 75Cr1 steel microstructure and properties prediction software.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG142.33
，
本文编号：2210649
[Abstract]:With the rapid development of construction, mining and other fields in our country, the domestic demand for saw blade steel is very large, especially the saw blade steel used in precision cutting equipment, which needs to be imported for a long time. The earliest developed steel 50Mn2V has been difficult to meet the needs of the further development of the domestic market, the development of a new type of saw blade steel with better performance has become the urgent need of many enterprises. High carbon alloy steel 75Cr1 steel with high hardness, high elasticity and excellent hardenability and wear resistance has become the newest representative of high end saw blade steel. In this paper, the single pass thermal deformation test of the test material was carried out with Gleeble-1500D thermal simulator, and the influence factors such as deformation resistance were studied by means of SEM, metallographic microscope and other equipment. The results showed that the lower the deformation temperature, the greater the strain rate. The stress-strain curve of test steel 75Cr1 is easier to show dynamic recrystallization type curve, and conversely, the stress-strain curve of work hardening type. The austenitic grain growth behavior of 75Cr1 steel was studied by heat preservation experiment. The results showed that the grain growth rate increased first with the increase of temperature and then tended to be smooth, and combined with the model of grain growth of C-Mn steel proposed by Sellars, the austenite grain growth behavior of 75Cr1 steel was studied. The activation energy of grain growth Q1. 57 脳 10 6 J / mol was calculated, and the grain growth model of 75Cr1 steel was derived according to the hyperbolic sinusoidal function proposed by Tegart, and the linear regression method was applied. The thermal deformation activation energy (Qd=264.4KJ/mol,) of test steel 75Cr1 is calculated by calculating the thermal deformation equation of 75Cr1 steel: E9.4310-3 [sinh (010105 蟽)] 3.24) exp (264.4/RT based on the evolution of storage energy, and by fitting the original experimental data of thermal deformation, the critical recovery / dynamic recrystallization point on the stress-strain curve is accurately located. Based on the evolution law, a new method for calculating dynamic recrystallization fraction XD. of 75Cr1 steel was proposed. This idea can solve the difficulty of calculating the integral number of recrystallized volume on the stress-strain curve without obvious peak value, but the accuracy in practical application still needs to be discussed. The austenitic grain growth model, hot deformation model, dynamic recrystallization model and rheological stress model of 75Cr1 steel can be further developed as the basic physical metallurgical model in the research and development of 75Cr1 steel microstructure and properties prediction software.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG142.33
，
本文编号：2210649
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