【摘要】：齒輪是重要的傳動(dòng)構(gòu)件,為了提高傳動(dòng)的穩(wěn)定性以及齒輪的壽命,齒輪鋼的制備與性能特別重要。42CrMo是一種Cr-Mo系齒輪鋼,具有較好的強(qiáng)度、韌性以及淬透性,沒有很明顯的回火脆性,可用于制備截面較大的齒輪。進(jìn)一步提高42CrMo的力學(xué)性能,對(duì)工業(yè)生產(chǎn)有著重要意義。電脈沖處理是一種極端非平衡過(guò)程,在其產(chǎn)生的熱-力-電耦合的復(fù)合物理場(chǎng)作用下,金屬材料的性能會(huì)顯著提高,同時(shí)還具有節(jié)能環(huán)保、高效低成本等優(yōu)勢(shì)。本文以42CrMo齒輪鋼為實(shí)驗(yàn)材料,研究了電脈沖淬火/回火、傳統(tǒng)淬火/回火以及不同的淬回火交叉工藝對(duì)42CrMo齒輪鋼力學(xué)性能與顯微組織演變的影響,并探討了電脈沖處理的強(qiáng)化機(jī)制。與傳統(tǒng)淬火相比,電脈沖淬火處理后,42CrMo的晶粒更細(xì),約為6-13μm,組織向馬氏體轉(zhuǎn)變,力學(xué)性能更優(yōu)異:抗拉強(qiáng)度為1998MPa,比初始態(tài)提高了81.6%;顯微硬度達(dá)到943.2 HV,比初始態(tài)提高了186.9%;位錯(cuò)密度為1.69×1016m-2,比傳統(tǒng)淬火態(tài)高出6.17倍。脈沖淬火態(tài)的試樣經(jīng)回火后出現(xiàn)了層狀回火組織,試樣的力學(xué)性能都比傳統(tǒng)淬火態(tài)經(jīng)回火處理后的好,其中電脈沖調(diào)質(zhì)處理后的試樣,力學(xué)性能最佳,抗拉強(qiáng)度為1810MPa,延伸率為16.6%,其強(qiáng)塑積為30046MPa.%,比初始態(tài)提高了79.7%;對(duì)傳統(tǒng)淬火態(tài)的試樣進(jìn)行一次脈沖回火處理,力學(xué)性能與其他三種調(diào)質(zhì)工藝相比最差,進(jìn)行兩次脈沖回火處理,試樣會(huì)產(chǎn)生沿晶斷裂。經(jīng)回火后,位錯(cuò)密度均下降,經(jīng)電脈沖回火后,位錯(cuò)密度下降的幅度較小。系統(tǒng)的研究及分析后,我們發(fā)現(xiàn)電脈沖處理能更明顯的提高金屬材料的力學(xué)性能,可代替?zhèn)鹘y(tǒng)熱處理做為一種新的金屬材料強(qiáng)韌化手段。
[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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG142.1;TG162.73

【相似文獻(xiàn)】

相關(guān)期刊論文 前8條

1 徐根應(yīng),安運(yùn)錚;殘余應(yīng)力和組織結(jié)構(gòu)對(duì)提高感應(yīng)脈沖淬火件疲勞性能的作用[J];熱加工工藝;1991年06期

2 徐根應(yīng),安運(yùn)錚;鋼的高能量密度感應(yīng)脈沖淬火工藝及理論基礎(chǔ)研究[J];中外技術(shù)情報(bào);1996年09期

3 常儒，徐根應(yīng);典型工件大功率感應(yīng)脈沖淬火[J];西安理工大學(xué)學(xué)報(bào);1995年03期

4 李平,劉長(zhǎng)生;木工帶鋸鋸齒的高頻脈沖淬火[J];木工機(jī)床;1999年Z1期

5 徐根應(yīng);安運(yùn)錚;;結(jié)構(gòu)鋼大功率感應(yīng)脈沖淬火件抗彎曲疲勞特性研究[J];安徽工學(xué)院學(xué)報(bào);1991年04期

6 常儒，安運(yùn)錚，趙錦江;大功率感應(yīng)脈沖淬火技術(shù)的應(yīng)用研究[J];熱加工工藝;1994年06期

7 陳波;張燁;;GCr15軸承鋼在電脈沖作用下的淬火和低溫回火新工藝[J];科技資訊;2010年20期

8 ;[J];;年期

相關(guān)會(huì)議論文 前1條

1 ;題錄[A];首屆中國(guó)功能材料及其應(yīng)用學(xué)術(shù)會(huì)議論文集[C];1992年

相關(guān)碩士學(xué)位論文 前1條

1 潘棟;脈沖電流調(diào)質(zhì)處理對(duì)42CrMo齒輪鋼組織與性能的影響[D];吉林大學(xué);2016年

，

本文編號(hào)：2234124