脉冲电流调质处理对42CrMo齿轮钢组织与性能的影响
发布时间：2018-09-10 10:00
【摘要】：齿轮是重要的传动构件,为了提高传动的稳定性以及齿轮的寿命,齿轮钢的制备与性能特别重要。42CrMo是一种Cr-Mo系齿轮钢,具有较好的强度、韧性以及淬透性,没有很明显的回火脆性,可用于制备截面较大的齿轮。进一步提高42CrMo的力学性能,对工业生产有着重要意义。电脉冲处理是一种极端非平衡过程,在其产生的热-力-电耦合的复合物理场作用下,金属材料的性能会显著提高,同时还具有节能环保、高效低成本等优势。本文以42CrMo齿轮钢为实验材料,研究了电脉冲淬火/回火、传统淬火/回火以及不同的淬回火交叉工艺对42CrMo齿轮钢力学性能与显微组织演变的影响,并探讨了电脉冲处理的强化机制。与传统淬火相比,电脉冲淬火处理后,42CrMo的晶粒更细,约为6-13μm,组织向马氏体转变,力学性能更优异:抗拉强度为1998MPa,比初始态提高了81.6%;显微硬度达到943.2 HV,比初始态提高了186.9%;位错密度为1.69×1016m-2,比传统淬火态高出6.17倍。脉冲淬火态的试样经回火后出现了层状回火组织,试样的力学性能都比传统淬火态经回火处理后的好,其中电脉冲调质处理后的试样,力学性能最佳,抗拉强度为1810MPa,延伸率为16.6%,其强塑积为30046MPa.%,比初始态提高了79.7%;对传统淬火态的试样进行一次脉冲回火处理,力学性能与其他三种调质工艺相比最差,进行两次脉冲回火处理,试样会产生沿晶断裂。经回火后,位错密度均下降,经电脉冲回火后,位错密度下降的幅度较小。系统的研究及分析后,我们发现电脉冲处理能更明显的提高金属材料的力学性能,可代替传统热处理做为一种新的金属材料强韧化手段。
[Abstract]:Gear is an important transmission component. In order to improve the stability of transmission and the service life of gear, the preparation and properties of gear steel are very important. 42CrMo is a kind of Cr-Mo gear steel, which has good strength, toughness and hardenability. Without obvious tempering brittleness, it can be used to prepare gears with larger cross section. Further improving the mechanical properties of 42CrMo is of great significance to industrial production. Electric pulse processing is an extreme non-equilibrium process. Under the combined physical field of thermal-mechanic-electric coupling, the performance of metal materials will be improved significantly, and it will also have the advantages of energy saving and environmental protection, high efficiency and low cost. In this paper, the effects of electric pulse quenching / tempering, traditional quenching / tempering and different quenching and tempering cross processes on the mechanical properties and microstructure evolution of 42CrMo gear steel were studied. The strengthening mechanism of electric pulse processing is also discussed. Compared with conventional quenching, the grain size of 42CrMo after electric pulse quenching is smaller, about 6-13 渭 m, and the microstructure is transformed to martensite. The mechanical properties are better: tensile strength of 1998MPa, microhardness of 943.2 HV, and dislocation density of 1.69 脳 10 ~ (16) m ~ (-2), 6.17 times higher than that of traditional quenched state. After tempering the samples in the pulse quenching state, the layered tempering structure appears, and the mechanical properties of the samples are better than those of the traditional quenched state, and the mechanical properties of the samples treated by electric pulse tempering are the best. The tensile strength is 1810 MPA, the elongation is 16. 6, its strong plastic product is 30046 MPa.It is 79.7% higher than the initial state. The mechanical properties of the traditional quenched samples after one pulse tempering are the worst compared with the other three tempering processes. Intergranular fracture occurs in the specimen. After tempering, the dislocation density decreased, but after pulse tempering, the dislocation density decreased slightly. After the systematic research and analysis, we found that the electrical pulse treatment can improve the mechanical properties of metal materials more obviously, and can replace the traditional heat treatment as a new means of strengthening and toughening metal materials.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG142.1;TG162.73
本文编号：2234124
[Abstract]:Gear is an important transmission component. In order to improve the stability of transmission and the service life of gear, the preparation and properties of gear steel are very important. 42CrMo is a kind of Cr-Mo gear steel, which has good strength, toughness and hardenability. Without obvious tempering brittleness, it can be used to prepare gears with larger cross section. Further improving the mechanical properties of 42CrMo is of great significance to industrial production. Electric pulse processing is an extreme non-equilibrium process. Under the combined physical field of thermal-mechanic-electric coupling, the performance of metal materials will be improved significantly, and it will also have the advantages of energy saving and environmental protection, high efficiency and low cost. In this paper, the effects of electric pulse quenching / tempering, traditional quenching / tempering and different quenching and tempering cross processes on the mechanical properties and microstructure evolution of 42CrMo gear steel were studied. The strengthening mechanism of electric pulse processing is also discussed. Compared with conventional quenching, the grain size of 42CrMo after electric pulse quenching is smaller, about 6-13 渭 m, and the microstructure is transformed to martensite. The mechanical properties are better: tensile strength of 1998MPa, microhardness of 943.2 HV, and dislocation density of 1.69 脳 10 ~ (16) m ~ (-2), 6.17 times higher than that of traditional quenched state. After tempering the samples in the pulse quenching state, the layered tempering structure appears, and the mechanical properties of the samples are better than those of the traditional quenched state, and the mechanical properties of the samples treated by electric pulse tempering are the best. The tensile strength is 1810 MPA, the elongation is 16. 6, its strong plastic product is 30046 MPa.It is 79.7% higher than the initial state. The mechanical properties of the traditional quenched samples after one pulse tempering are the worst compared with the other three tempering processes. Intergranular fracture occurs in the specimen. After tempering, the dislocation density decreased, but after pulse tempering, the dislocation density decreased slightly. After the systematic research and analysis, we found that the electrical pulse treatment can improve the mechanical properties of metal materials more obviously, and can replace the traditional heat treatment as a new means of strengthening and toughening metal materials.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG142.1;TG162.73
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