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DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林新智 | |
dc.contributor.author | Jen-Wei Liu | en |
dc.contributor.author | 劉仁偉 | zh_TW |
dc.date.accessioned | 2021-07-10T21:33:10Z | - |
dc.date.available | 2021-07-10T21:33:10Z | - |
dc.date.copyright | 2017-08-29 | |
dc.date.issued | 2017 | |
dc.date.submitted | 2017-07-17 | |
dc.identifier.citation | 1. https://www.ssab.com/products/brands/hardox/products/hardox-500
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76573 | - |
dc.description.abstract | PA500H鋼材為性質優良的耐磨鋼,屬於麻田散鐵系超高強度鋼,廣泛的使用在挖土機的鏟刀、自卸車的車斗、礦場的粉碎機,淬火態最大抗拉強度可達1700 MPa,180℃-400℃回火態最大抗拉強度皆大於1200 MPa,於前人的研究中,抗拉強度大於1000 MPa的超高強度鋼只需要1-3 ppm的氫便會發生氫脆,且麻田散鐵組織為對氫脆最敏感的組織,因此本研究利用電化學的方式對PA500H鋼材進行充氫,並利用拉伸試驗、定應力試驗、衝擊試驗,評估氫脆對PA500H鋼材機械性質之影響,此外利用OM、SEM、TEM對PA500H鋼材進行觀察,釐清PA500H顯微結構與氫脆現象之關連。
本研究使用PA500H-A及PA500H-B兩鋼材,前者鎳含量為0.46 %,後者鎳含量為0.92 %,淬火態為中鋼所熔煉軋延之DQ材,利用鹽浴爐對其進行不同溫度的回火熱處理,並進行後續之實驗。 實驗結果可以發現,DQ態有著最嚴重的氫脆現象,顯示麻田散鐵組織受到氫脆的影響相當嚴重,而180℃回火態可以大幅提升鋼材的抗氫脆能力,為本研究中最佳的回火參數,此時細小ε碳化物在麻田散鐵板條之內析出,為良好氫捕集位置,300℃及400℃回火態,氫脆現象再次變得嚴重,此時板條內的細小ε碳化物轉變為細小雪明碳鐵,且板條之間析出薄膜狀雪明碳鐵,板條內細小雪明碳鐵捕集氫能力不及ε碳化物,板條間雪明碳鐵又將氫捕集於板條界面,對於抗氫脆具有不良影響。 整體而言,鎳含量較高的PA500H-B具有較佳的抗氫脆能力,鎳在鋼鐵中以固溶原子存在,由於原子大小不同,固溶原子周圍會形成晶格扭曲,亦為氫捕集位置之一,鎳添加提升抗氫脆能力的現象在DQ態較為明顯,回火態由於碳化物的氫捕集能力較強,因此由碳化物主導,鎳添加所造成的抗氫脆差異便較不明顯。 | zh_TW |
dc.description.abstract | PA500H steel is a high class wear-resistant steel. It belongs to martensitic type ultra-high strength steel. It is widely used in excavator, dump truck and crusher. In quenching state, the ultimate tensile strength can reach 1700 MPa. In 180 ℃ - 400 ℃ tempering state, the ultimate tensile strength can be higher than 1200 MPa. As reported in many early researches, martensitic type steels were very sensitive to hydrogen embrittlement. Only 1-3 ppm hydrogen could lead to hydrogen embrittlement for high strength steels with tensile strength higher than 1000 MPa, especially for the martensite structure. Hence, we study the hydrogen embrittlement phenomenon of PA500H by using the electrochemical method to charge hydrogen. Then, the general and constant-load tensile test and impact test are used to evaluate the hydrogen embrittlement effect on the mechanical properties of PA500H steels. Meanwhile, the microstructure analyses of OM, SEM and TEM are also used to clarify the relationship between microstructure and hydrogen embrittlement phenomenon of PA500H steels.
In this research, PA500H-A and PA500H-B steels are studied. The former has lower nickel content, 0.46 %. The latter has higher nickel content, 0.92 %. The quenching state steels were prepared by CSC Company with DQ process. The temper treatments of these steels were executed by using the hot salt bath at various temperatures. Then, various tests were carried out for these tempered specimens. Experimental results show that the DQ state exhibits severe hydrogen embrittlement. This demonstrates that the martensite structure is quite sensitive to hydrogen embrittlement. After 180 ℃ tempering, the tempered martensite increases substantially the resistance of hydrogen embrittlement. In 180 ℃ tempering state, a lot of fine epsilon carbides precipitate inside the martensite laths. Epsilon carbides are good hydrogen trapping sites and are able to enhance the hydrogen embrittlement resistance. After 300 ℃ and 400 ℃ tempering, the hydrogen embrittlement phenomenon becomes serious again. In these tempering states, the fine epsilon carbides transfer to fine cementite. In addition, the film-like cementite also precipitates between the martensite laths. These fine cementite and film-like cementite have weaker hydrogen trapping ability than the epsilon carbide. Especially, the film-like cementite will trap the hydrogen around the martensite laths and this feature is harmful and leads to lower hydrogen embrittlement resistance. Overall, PA500H-B can exhibit better hydrogen embrittlement resistance because it has higher nickel content. These solid-solved nickel atoms in steel will induce the lattice distortion. These distorted lattice sites are also preferential hydrogen trapping sites. This feature will enhance the hydrogen embrittlement resistance. The improvement of hydrogen embrittlement resistance due to nickel addition is only obvious in DQ state. In tempering state, the carbides are stronger hydrogen trapping sites than the nickel induced lattice distortion sites. Hence, the carbides have a dominate effect on the hydrogen embrittlement resistance. As a result, the hydrogen embrittlement resistances in the tempering state are similar for both PA500H-A and PA500H-B steels. | en |
dc.description.provenance | Made available in DSpace on 2021-07-10T21:33:10Z (GMT). No. of bitstreams: 1 ntu-106-R04527007-1.pdf: 35086656 bytes, checksum: 884a4cd8e4a56a81eae1f5e8fceea5d0 (MD5) Previous issue date: 2017 | en |
dc.description.tableofcontents | 誌謝 III
摘要 IV Abstract V 目錄 VII 圖目錄 X 表目錄 XV 第一章 前言 1 第二章 文獻回顧 2 2.1 先進高強度鋼(AHSS)介紹 2 2.1.1 雙相鋼 3 2.1.2 多相鋼 3 2.1.3 麻田散鐵鋼 4 2.1.4 變態誘發塑性鋼 (TRIP Steel) 4 2.1.5 雙晶誘發塑性鋼 (TWIP Steel) 5 2.2 PA500H耐磨鋼板介紹 5 2.3 合金添加 6 2.3.1 碳 6 2.3.2 矽 6 2.3.3 錳 6 2.3.4 鎳 6 2.3.5 鉻 6 2.3.6 鉬 7 2.3.7 硼 7 2.3.8 鈦 7 2.3.9 鋁 7 2.3.10 磷 7 2.3.11 硫 7 2.4 鋼鐵組織介紹 8 2.4.1 麻田散鐵 8 2.4.2 回火麻田散鐵與碳化物 10 2.4.3 自回火麻田散鐵 (Auto-temper Martensite) 13 2.4.4 殘留沃斯田鐵 14 2.5 氫脆現象 15 2.6 氫進入材料內部 16 2.6.1 氫氣分子 16 2.6.2 氫離子H+ 17 2.6.3 幫助氫進入材料的物質 18 2.7 氫在材料內的擴散 18 2.8 氫捕集位置 19 2.9 氫脆理論 20 2.9.1 氫化物形成理論(Hydride Formation) 20 2.9.2 內壓理論(Internal Pressure) 21 2.9.3 氫致鍵結弱化理論(Hydrogen Enhanced Decohesion, HEDE) 22 2.9.4 氫致局部塑性變形理論(Hydrogen Enhanced Local Plasticity, HELP) 23 2.9.5 差排發射理論(Adsorption-Induced Dislocation Emission, AIDE) 24 2.9.6 混合理論 25 2.10 元素添加對氫脆的影響 26 2.11 回火脆性 27 2.12 材料的破斷面分析 28 2.12.1 渦穴組織 28 2.12.2 劈裂組織 29 2.12.3 半劈裂組織(Quasi-Cleavage) 29 2.12.4 沿晶破壞 30 第三章 實驗方法 31 3.1 實驗流程 31 3.2 PA500H合金設計與成分分析 31 3.3 鋼材熱處理 32 3.4 試片加工 33 3.5 金相試片製備 33 3.6 TEM試片製備 34 3.7 電化學充氫 34 3.8 硬度試驗 34 3.9 一般拉伸與充氫拉伸 35 3.10 延遲破壞定應力拉伸 35 3.11 衝擊與充氫衝擊 36 第四章 結果與討論 37 4.1 成分分析 37 4.2原沃斯田鐵觀察(Prior Austenite Grain) 37 4.3麻田散鐵與回火麻田散鐵觀察 38 4.4 DQ態麻田散鐵觀察 40 4.5殘留沃斯田鐵觀察 41 4.6殘留沃斯田鐵XRD分析 43 4.7碳化物析出觀察 43 4.8硬度試驗 48 4.9拉伸試驗 49 4.10充氫拉伸試驗 51 4.11定應力試驗 56 4.12衝擊試驗 57 4.13充氫衝擊 58 4.14一般拉伸破斷面觀察 60 4.15充氫拉伸破斷面觀察 65 4.16定應力拉伸破斷面觀察 70 4.17 衝擊破斷面觀察 74 4.18 充氫衝擊破斷面觀察 79 第五章 結論 84 參考文獻 87 | |
dc.language.iso | zh-TW | |
dc.title | 回火熱處理對PA500H耐磨鋼板之氫脆性質研究 | zh_TW |
dc.title | The influence of tempering treatment on the hydrogen embrittlement of PA500H wear-resistant steel | en |
dc.type | Thesis | |
dc.date.schoolyear | 105-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 楊哲人,薛人愷,蔡履文 | |
dc.subject.keyword | PA500H鋼材,麻田散鐵系耐磨鋼,回火處理,氫脆, | zh_TW |
dc.subject.keyword | PA500H Steel,Martensitic Type Wear-Resistant Steel,Tempering Treatment,Hydrogen Embrittlement, | en |
dc.relation.page | 91 | |
dc.identifier.doi | 10.6342/NTU201701425 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2017-07-17 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
顯示於系所單位: | 材料科學與工程學系 |
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