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題 名 | 鋁系片狀石墨耐熱鑄鐵高溫氧化性質之研究=The High Temperature Oxidation Property of Aluminum-based Flake Graphite Heat Resistant Cast Iron |
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作 者 | 楊榮顯; 蕭錫謙; 陳紀任; | 書刊名 | 鑄工 |
卷 期 | 27:4=111 2001.12[民90.12] |
頁 次 | 頁1-8 |
分類號 | 472.2 |
關鍵詞 | 鋁系片狀石墨耐熱鑄鐵; 耐氧化性; 顯微組織; Aluminum-based flake graphite heat resistant cast iron; Oxidation resistance; Metallographic microstucture; |
語 文 | 中文(Chinese) |
中文摘要 | 由於耐熱鑄鐵在工業上應用廣泛,因此有必要對其高溫性質加以探討,本研究主要探討鋁系片狀耐熱鑄鐵之高溫氧化現象;針對片狀石墨鑄鐵及不同的添加合金(Al、C、Si、Mn),在固定的試片尺寸下(φ 20mm × 30mm ),在探討各高溫下(673K、873K、1073K、1273K)的氧化速度,並透過金相顯微鏡來觀察其組織變化, 最後對其耐氧化性的變化做解析及評估。 鋁系片狀石墨耐熱鑄鐵高溫氧化性質之實驗結果顯示,(1)由於鑄鐵內含有石墨,在高溫下會有不同程度的脫碳,因此退火狀態之試片已有某種程度的脫碳,所以退火狀態之試片其耐氧化性優於鑄造狀態之試片。(2)試驗溫度673K、氧化時間100hr時,試片重量有明顯的變化,而氧化速度則有上升的現象;以添加2.5% Al-0.5% Mn之低鋁耐熱鑄鐵(退火狀態)有較佳的耐氧化性。(3)試驗溫度1073K、氧化時間50hr時,各個試片的重量變化因脫碳影響而呈現減少的現象,以添加22% Al-0.7% Mn之高鋁耐熱鑄鐵(鑄態及退火狀態)有較佳的耐氧化性。(4)重量變化與氧化速度有對應的關係,即重量變化較小時,其氧化速度也比較小;若重量變化越大則氧化速度越大;若氧化速度為零時,表示生成保護性的氧化膜。 添加不同鋁含量之低鋁、中鋁、高鋁片狀石墨耐熱鑄鐵,其組織內的片狀石墨會隨著鋁含量的增加而逐漸由粗大變成微細。 |
英文摘要 | The heat resistant cast irons have been used extensively in the industry, so it must be studied on the high temperature property. The objective of this study is to investigate the high temperature oxidation property of aluminum-based flake graphite heat resistant cast irons. The effects of flake graphite morphology and various alloy additions (Al、C、Si、Mn) on the oxidation resistance (weight variation, oxidation rate) at different temperatures (673K,873K,1073K,1273K) of aluminum-based cast irons have been evaluated in this study by using the specimen size of φ 20mm × 30mm for the oxidation test. Meanwhile, we observed the metallographic microstructure changes by the metallurgical microscope to analysis and evaluate the change of oxidation resistance. According to the results of this study know that: (1) As a result of cast irons used contains graphite which will cause various degrees of decarburization at the high temperature, so the oxidation resistance of specimens with annealed treatment is better than the as-cast specimens. (2) During the transient stage of oxidation up to 100hr at 673K, the variations of weight of the speciments have been changed in evidence and the rate of oxidation are rising. It contains 2.5% Al and 0.5% Mn of low aluminum flake graphite heat resistant cast irons with annealed treatment shows better oxidation resistance. (3) During the transient stage of oxidation up to 50hr at 1073K, the loss of weight for all specimens is caused by decarburization. High aluminum heat resistant case irons contains 22% Al and 0.7% Mn of as-cast or annealed to show better oxidation resistance. (4) The relationship between the variation of weight and the rate of oxidation are: The rate of oxidation becomes smaller when the variation of weight is small, and the rate of oxidation becomes larger when the variation of weight is large. If the rate of oxidation becomes zero, it shows that the protective oxide film has been formed. For the aluminum-based flake graphite heat resistant cast irons when the aluminum contents increased then the flake graphite in the matrix changed from coarse to fine form gradually. |
本系統中英文摘要資訊取自各篇刊載內容。