Al-7% Mg 합금의 β-상 고용거동과 기계적 성질

박상보,최종술 대한금속재료학회(대한금속학회) 1976 대한금속·재료학회지 Vol.14 No.4

高純度 알루미늄과 마그네슘 金屬을 가지고 Al-7% Mg 二元合金을 熔製하여서 所定形狀의 各種試片을 製作하여 다음과 같은 몇 가지 試驗들을 行했다. (1) 350∼450℃間의 各溫度에서 恒溫加熱時의 β-相固溶 곡선을 얻어서 溫度와 時間의 두 變數에 대한 固溶擧動을 檢討하였다. (2) β-相固溶에 따른 引張强度 및 伸率을 調査하였으며 (3) 또, β-相固溶에 따른 衝擊靭性을 調査하고 동시에 破面樣相을 관찰하였다. 以上의 調査들로부터, 이 合金에 있어서 强度와 靭性의 좋은 組合을 나타내는 最適條件의 熱處理가 제시되었다.

SBR 유화중합에 의한 미세구조 조절과 그의 물성에 관한 연구 (Ⅲ) - 입자크기조절

박상보,신영조 한국고분자학회 1989 한국고분자학회 학술대회 연구논문 초록집 Vol.1989 No.4

A1-Si 共晶系合金의 熔解 및 鑄入溫度가 機械的性質에 미치는 影響에 關한 硏究

朴尙輔 大田工業專門大學 1981 論文集 Vol.28 No.-

Al-Si 共晶系合金의 鎔解溫度 및 鑄入溫度가 機械的性質에 미치는 影響을 調査 檢討하였다. 특히 Al-Si 合金에서 Ni, Cu, Mg을 添加시킨후 20℃-30℃의 차이를 두고 20種의 試料를 ??作한 다음 熱處埋등을 行하여 다음과 같은 結論을 얻었다. 가장 적합한 鎔解溫度 및 鑄入溫度는鎔解溫度 800℃에서 鑄入溫度 740℃~770℃의 溫度 구역이었다. 700℃~800℃의 溫度구역에시는 鎔解溫度 및 鑄入溫度가 높을수록 引張强度는 增價하였으며 最大引張强度는 鎔解溫度 800℃에서 鎔解溫度 740℃~770℃ 溫度區域이었다. Al-Si 合金에 Ni, Cu, Mg을 添加한 多元系合金에 있어서는 引張强度에 미치는 熱處理效果는 대단히 크다. 硬度와 Si이 徵細化는 일치하지 않았으며 Si의 微細化는 引張强度를 增加시킨다. The effect on the Mechanical Properties of Al-Si eutectic System alloy are examined according to melting and pouring temperature. Particularly, 20 Kinds of test pieces were manufactured by adding Nikel, Cupper, Magnesium to Al-Si system al toy in accordance with 20∼30℃ pouring temperature difference, and heat-treated. The following results obtained; The best adequate pouring temperature is the range from 740℃ to 770℃ when melting temperature is 800℃. On above mentioned conditions, maximum tensile atrength acquired. In the melting temperature range from 700℃ to 800℃, the higher pouring temperature, the higher tensile strength. In the polynary alloy adding Nikel, Cupper, Magnesium to Al-Si alloy, the heat treatment effects very large in the tensile strength. Si-refining does not agreed with the hardness and increases the tensile strength.

Al-4.5% Cu合金의 機械的性質에 미치는 Si,Mg 및 Zn의 影響에 關한 硏究

朴尙輔 大田工業專門大學 1982 論文集 Vol.31 No.-

Al-Zn-Mg-Cu合金의 析出硬化 및 加工度의 影響에 關한 硏究

朴尙輔 大田工業大學 1988 한밭대학교 논문집 Vol.5 No.2

As the results of the comparison and the examination for the age hardening according to the reduction changes of Al-Zn-Mg-Cu alloy, the following results are obtained; 1. The more the reductions are increased, the more the grains are fine in the direction of L and ST, 2. As the reduction are increased from 10% to 60%, the hardness rapidly increased on the conditions of up to 18hrs of aging time, and the max, hardness is obtained on the condition of the aging temp 90℃ by the reduction 60%. 3. As the ageing temp. are increased from 90℃ to 150℃, the hardness are decreased by the retrogression phenomena over the 24hrs of ageing time. 4. The hardness are increased by the rehardening on the condition of the 42hrs and 96hrs of ageing time at the ageing temp. 90℃, and the 48hrs and 96hrs of the ageing time at 1:he ageing temp. 120℃ and 150℃.

Cr-Mo망의 破壞靭性에 미치는 熱處理影響에 關한 硏究

朴尙輔 大田工業專門大學 1983 論文集 Vol.33 No.-

In this study, the effect of temperature change in the heat-treatment to the fracture toughness of Cr-Mo Martensite steel are investigated. On the results of investigating and reviewing the Repeat Quenching and the roll Quenching in the Conventional Quenching that can improve the mechanical properties, The results ob tamed are as follows: 1. In case that CrMo steel temperature about 200℃ after quenching are used as the High, tensile structural steels, if those are quenched on the temperature 1000℃ or to take the roll quenching on the temperature 850℃, tile fracture toughness KIC are increased in the region of High Strength. 2. Although the tensile strength of the materials taken the repeat quenching are larger than that taken the conventional quenching on the temperature 850℃, the improvements of KIC are not expeeted. 3. It the quenching temperature of the materials taken the conventionals quenching will be 1150℃ in such a case of tempering temperature being below 400℃ KIC should be increased without decreasing the strength.

Mo-65.8at%Si 혼합분말의 기계적 합금화에 미치는 밀링매체 재료의 영향

박상보 한국분말야금학회 1997 한국분말재료학회지 (KPMI) Vol.4 No.3

Milling media of steel and zirconia were used to produce $MoSi_2$ by mechanical alloying (MA) of Mo and Si powders. The effect of milling media on MA of Mo-65.8at%Si powder mixture has been investigated by SEM, XRD, DTh and in-situ thermal analysis. The powders mechanically alloyed by milling medium of steel for 8 hours showed the structure of fine mixture of Mo and Si, and those mechanically alloyed by milling medium of zirconia for longer milling time showed the structure of fine mixture of Mo and Si. The tetragonal $\alpha$-$MoSi_2$ Phase and the tetragonal $Mo_5Si_3$ phase appeared with small Mo peaks in the powders milled by milling medium of steel for 4 and 8 hours. The $\alpha$-$MoSi_2$ phase and the hexagonal $\beta$-$MoSi_2$ phase were formed after longer milling time. The $\alpha$-$MoSi_2$ phase appeared with large Mo peaks in the powders milled by milling medium of zirconia for 4 hours. The phases, $\alpha$-$MoSi_2$ and $\beta$-$MoSi_2$. were formed in the powders milled for longer milling time. DTA and annealing results showed that Mo and Si were transformed into $\alpha$-$MoSi_2$ and $Mo_5Si_3$, while $\beta$-$MoSi_2$ into $\alpha$-$MoSi_2$. In-situ thermal analysis results demonstrated that there were a sudden temperature rise at 212 min and a gradual increase in temperature in case of milling media of steel and zirconia, respectively. The results indicate that MA can be influenced by materials of milling medium which can give either impact energy on powders or thermal energy accumulated in vial.

Mo-65.8at%Si 혼합분말의 기계적 합금화에 미치는 밀링매체 재료의 영향

박상보,변창섭,박인용,김동관,이진형 대전산업대학교 반도체기술연구소 1999 半導體技術硏究所報 Vol.1 No.-

Milling media of steel and zirconia were used to produce Mosi_2 by mechanical alloying (MA) of Mo and Si powders. The effect of milling media on Ma ofMo-65.8at%Si powder mixture has been investigated by SEM, XRD, DTA and in-situ thermal analysis. The powders mechanically alloyed by milling medium of steel for 8 hours showed the structure of the mixture of Mo and Si, and those mechanically alloyed by milling medium of zirconia for longer milling time showed the structure of fine mixture of Mo and Si. The tetragonal a-MoSi_2 phase and the tetragonal Mo_5Si_3 phase appeared with small Mo peaks in the powders milled by milling medium of steel for 4 and 8 hours. The a-MoSi_2 phase and the hexagonal B-MoSi_2 phase were formed after longer milling time. The a-MoSi_2 phase appeared with large Mo peaks in the powders milled by milling medium of zirconia for 4 hours. The phases, a-MoSi_2 and B-MoSi_2, were formed in the powders milled for longer milling time. DTA and annealing refults showed that Mo and Si were transformed into a-MoSi_2 and Mo_5Si_3, while B-MoSi_2 into a-MoSi_2. In-situ thermal analysis results demonstrated that there were a sudden temperature rise at 212 min and a gradual increase in temperature in case of milling media of steel and zirconia, respectively. The results indicate that MA can be influenced by materials of milling medium which can give either impact energy on powders or thermal energy accumulated in vial.

비정형 건축형태에 나타난 변형적 사고에 관한 연구

박상보,송대호,박춘근 대한건축학회 2000 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.20 No.2

Slag를 利用한 自硬性鑄型法에 關한 硏究

朴尙輔 大田開放大學 1985 論文集 Vol.3 No.-

電氣爐등에서 나오는 대량의 폐기물인 Slag를 硬化劑로 利用하여 大型鑛物 등에서 작업공수를 줄이고 高價인 Co_2 gas를 줄여 生産原價를 節減하기 위하여 鑛物砂에 Slag, Water glass, NaHCo_3 등의 配合比에 따루 硬化時間과 抗雇力의 關係등을 比較 檢討하여 다음의 結論을 얻었다. 1. 鑛物砂 100Part에 對하여 Waterglass 6part, Slag 5part일 때 抗壓力은 最大값을 나타했으며 放置時間이 길어짐에 따라 抗壓力은 增加하였다. 2. 上記(1)의 配合比에 Slag와 NaHCo_3를 10:1로 混合添加 함으로써 Slag 單獨 添加時보다 抗壓力은 約60% 增加 하였으며 역시 放置時間이 길어짐에 따라 抗壓力도 增加 하였다. 3. Co_2法을 Slag法으로 대치하여 原價의 節減얻을 수 있다. 4. 5139亭의 염기도가 增加하면 抗歷力은 增加하였으며 Mgo의 增加는 抗歷力을 減少하였다. For the purpose of reducing production cost In large moulds by using slag (the waste material extracted from electric furnace) as hardening agent, slag, water glass and NaHCO_3 etc. are mixed in the moulding sand At this time, the relation of the hardening time and the compressive strength in accordance with the mixing rate are compared and investigated. The following conclusions are obtained; 1. When the mixing rate are the moulding sand (100 parts), water glass (6 part), and slag (5 parts), the compressive strength is maximum and increases as longer air hardening time. 2. When slag (10) and NaHCO_3(1) are added in stead of slag (5 part) in the mixing rate mentioned above, the compressive strength increases about 60% than that used no hardening agents. 3. The production costs are reduced by using slag method instead of CO_2 method