本文選題：等溫淬火球墨鑄鐵 + 有限單元法　； 參考：《長春工業(yè)大學(xué)》2017年碩士論文

【摘要】：材料表面刮傷現(xiàn)象經(jīng)常出現(xiàn)在各類發(fā)動(dòng)機(jī)零部件上,如發(fā)動(dòng)機(jī)活塞,齒輪,凸輪以及傳動(dòng)軸。由于等溫淬火球墨鑄鐵(ADI)有很好的自潤滑性,所以這種材料的應(yīng)用變得越來越廣泛。由于刮傷問題嚴(yán)重影響結(jié)構(gòu)部件使用壽命,未得到有效提高ADI材料抗刮傷性能途徑,針對此問題,論文主要開展了以下三方面的研究工作:(1)推導(dǎo)金屬材料表面損傷本構(gòu)方程。簡化金屬材料表面損傷的基本物理過程,提出影響其變化的因素,依據(jù)機(jī)械動(dòng)力學(xué)基本方程構(gòu)建基礎(chǔ)本構(gòu)方程,引入應(yīng)力-應(yīng)變關(guān)系和熱力學(xué)條件,獲得有限單元法基本解算過程,依據(jù)金屬材料磨損影響因素的不同,綜合得到影響最終本構(gòu)方程的物理因素方法。(2)等溫淬火球墨鑄鐵材料的刮傷實(shí)驗(yàn)。研究等溫淬火球墨鑄鐵材料的刮傷實(shí)驗(yàn)原理及方法,獲得研究等溫淬火球墨鑄鐵材料的實(shí)驗(yàn)基本過程,針對每種類別材料都完成不同的熱處理工藝處理,選擇刮傷實(shí)驗(yàn)設(shè)備,完成包括粗糙度測試與硬度測試,選取最終優(yōu)質(zhì)樣品進(jìn)行刮傷實(shí)驗(yàn),獲取不同類別不同組的測試實(shí)驗(yàn)結(jié)果,對比了鎳元素含量對樣品抗刮傷性能的影響,對比了不同熱處理?xiàng)l件下刮傷載荷的變化以及材料硬度對劃痕的產(chǎn)生的影響。(3)構(gòu)建等溫淬火球墨鑄鐵材料刮傷模型。依據(jù)不同熱處理溫度,組成元素,潤滑條件,載荷受力面積等影響因素,重新構(gòu)建該材料對應(yīng)于磨損問題的基本屬性;構(gòu)建物理模型結(jié)構(gòu),完成瞬態(tài)熱固耦合分析,獲得不同壓力,不同時(shí)間,不同熱處理溫度,不同載荷面積的數(shù)據(jù)結(jié)果,完成數(shù)據(jù)處理及分析工作,為該材料的工程應(yīng)用問題提供相對準(zhǔn)確的物理模型。文章研究了金屬材料表面磨損力學(xué)本構(gòu)方程,獲得理想模型數(shù)據(jù),為等溫淬火球墨鑄鐵材料刮傷性能研究,提供物理模型,同時(shí)完成了等溫淬火球墨鑄鐵材料刮傷性能實(shí)驗(yàn)研究。實(shí)驗(yàn)結(jié)果證明,鎳含量較高的ADI有比較高的抗刮傷能力。同樣元素組成的樣品之間硬度并不是衡量刮傷性能的決定性因素。
[Abstract]:Surface scratches often occur in engine parts such as engine pistons, gears, cams and drive shafts. Due to the good self-lubricating properties of isothermal quenched ductile iron, the application of this material has become more and more extensive. As the problem of scratch seriously affects the service life of structural parts, it is not effective to improve the scratch resistance of ADI materials. Aiming at this problem, this paper mainly studies the following three aspects: 1) deducing the constitutive equation of surface damage of metal materials. The basic physical process of surface damage of metallic materials is simplified. The factors affecting the surface damage of metallic materials are proposed. The basic constitutive equations are constructed according to the basic equations of mechanical dynamics. The stress-strain relationship and thermodynamic conditions are introduced. The basic calculation process of finite element method was obtained. According to the different factors affecting the wear of metal materials, the scrape experiments of austempered ductile iron materials were obtained by synthesizing the physical factors that affect the final constitutive equation. The principle and method of scrape test of isothermal quenched ductile iron were studied, and the basic process of the experiment was obtained. According to the different heat treatment process of each kind of material, the scrape test equipment was selected. Finish the roughness test and hardness test, select the final high quality sample for scratch test, obtain the test results of different kinds of different groups, compare the effect of nickel content on the scratch resistance of the sample. The scrape model of isothermal quenched ductile iron was constructed by comparing the change of scrape load under different heat treatment conditions and the effect of hardness on scratch. According to the influence factors such as different heat treatment temperature, component element, lubrication condition, load force area and so on, the basic properties of the material corresponding to the wear problem are re-constructed, the physical model structure is constructed, and the transient thermal-solid coupling analysis is completed. The data of different pressure, different time, different heat treatment temperature and different load area are obtained, and the data processing and analysis work is completed, which provides a relatively accurate physical model for the engineering application of the material. In this paper, the constitutive equations of surface wear mechanics of metallic materials are studied, and the ideal model data are obtained, which provide a physical model for the study of scrape properties of isothermal quenched ductile iron materials. At the same time, the scrape properties of isothermal quenched ductile iron were studied. The experimental results show that ADI with higher nickel content has higher scrape resistance. Hardness between samples made of the same elements is not a decisive factor in determining scratch properties.
【學(xué)位授予單位】：長春工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG143.5

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