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구상흑연주철의 소성 및 파단거동 (破斷擧動) 에 관한 연구
강인찬 대한금속재료학회(대한금속학회) 1973 대한금속·재료학회지 Vol.11 No.3
基地가 pearlite, pearlite와 ferrite의 混合 및 ferrite로 되어있는 3種의 球狀黑鉛鑄鐵에 對한 塑性 및 破斷擧動을 調査한 結果 다음과 같은 結論을 얻었다. (1) 基地가 거의 大部分 ferrite로 分解된 것은 軟鋼과 비슷한 應力-變形曲線을 나타낸다. (2) 3種의 球狀黑鉛鑄鐵은 모두 變形速度 1.5×10^(-5)∼1.5×10^(-3) sec^(-1)인 범위內에서는 降伏强度 및 引張强度의 變形速度依存性은 거의없다. (3) 3種의 球狀黑鉛鑄鐵의 應力-變形曲線은 모두 σt=Kε^n_t 式을 잘 滿足시킨다. (4) 이들 球狀黑鉛鑄鐵의 引張强度, 伸張 및 衝擊値를 綜合한 結果 ferrite 基地를 갖는것이 强度와 延性의 가장 좋은 組合을 보여준다. (5) 衝擊試驗에 있어서 pearlite 基地들 갖는것은 典型的인 脆性破斷擧動을 나타내지만 다른 두組織을 갖는것들은 근소한 延性 破斷擧動을 보여준다. 이들 3種의 試料에 對한 衝擊 에너지는 모두 crack 發生 에너지에 相當 한다고 볼 수 있다. Nodular graphite cast irons which are consisting of three kinds of matrix, i.e. pearlite, mixture of pearlite and ferrite, and ferrite, have been prepared, then the plastic deformations and fracture behaviors have been studied by the methods of observing the stress-strain curves in tension test and load-time curves in impact test respectively. The results obtained are summarized as follows: (1) The stress-strain curves for the nodular graphite cast iron of ferrite matrix have shown discontinuous yielding behaviors as observed in those of mild steel. (2) The tensile and yield strength for the three kinds of nodular graphite cast iron are almost independent of the strain rate between 1.5×10^(-5) and 1.5×10^(-3)sec^(-1). (3) The equation σ_t=Kε^n_t seems to be correct in the plastic regions of the stress-strain curves for all kinds of nodular graphite cast irons we prepared. (4) The nodular graphite cast iron of ferrite matrix shows better performance is combination of strength and ductility compared with other two cast irons. (5) The nodular graphite cast irons of two types of matrix, ferrite, and mixture of pearlite and ferrite, show the quite similar fracture behaviors in impact tests. (6) It is concluded that the impact energies of the nodular graphite cast irons of three types of matrix are not more than the crack initiation energies.
강인찬,오승택,강동명,백승호 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.4
One aspect of the properties of austempered ductile iron (ADI) which should be exploited further in promoting engineering applications is their fracture toughness. In this study ductile irons with various Si content were austempered and the relationship among austempering temperatures, quantity of retained austenite and fracture characteristics was investigated. As Si content increases from 2.28% to 3.0%, the precipitation of carbide during bainite transformation is suppressed, and the fracture toughness and the amount of the retained austenite is increased. The high Si content limits the formation of martensite in the structure and minimizes segregation of other elements at cell boundaries. But in the excessive Si content (3.3%) showed the formation of islands of free ferrite in the bainitic structures and it decreased the fracture characteristics.
구상흑연주철의 파괴거동에 관한 AE 방법에 의한 연구 (1) : Sn 첨가량에 따른
강인찬,오덕수 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.3
The effects of the Sn content and microstructure on the tensile properties and the fracture behaviors of spheroidal graphite cast iron were investigated. Addition of 0.05% Sn promoted pearlitic structure of the matrix, which resulted in an enhancement of the yield strength and the fracture toughness of the alloy. Acoustic emission (AE) characterstics of the alloy during mechanical testing were also studied. The voltage range and the shape of AE waves during the deformation stage and the fracture stage varied with the Sn content in the alloy.
Glossy Ground Coat 에 의한 주철법랑에 관한 연구
강인찬,김창은,이희수 대한금속재료학회(대한금속학회) 1971 대한금속·재료학회지 Vol.9 No.1
주철법랑제조에 Glossy Ground Coat의 여러시유조건에 의하는 영향과 소지금속에 함유되어 있는 탄소형태에 따르는 영향을 검토하기 위하여 밀착성 측정, 내열충격성 측정, 발포현상 및 소지금속에 대한 조직을 관찰하였다. 본 연구로서 Ground Coat는 소지금속과 Cover Coat와의 밀착력 향상 역활보다 발포억제를 보다 더 주역활로 하고 있다는 것을 알게되었으며, 또한 소지금속의 조성, 특히 결합탄소와 유리탄소함량에 따라 법랑화에 큰 영향을 미친다는 것을 알 수 있었다. In order to examine the effects attendant upon varing conditions of glossy ground coat as well as upon the type of carbon contained in the base metal in manufacturing the ceramic coating on cast iron. I have measured the adherence of the wet-process cast iron enamels and the resistance of the thermal shocking, observed the blistering phenomena and surveyed the base with a microscope. This study showed that the ground coat played a main role more in forbidding the blistering than increasing the adherence between the base metal and the cover coat and that the adherence was affected strongly by the composition of the base metal, especially by the ratio of combined carbon and free carbon.
강인찬,이원식 대한금속재료학회(대한금속학회) 1971 대한금속·재료학회지 Vol.8 No.4
3˝칠드볼 생산시 금형온도를 변화시켜 볼표면이 美麗한 溫度인 170℃∼250℃의 溫度區間을 찾고 이 溫度 범위 내에서 化學成分을 變化시켜 칠의 깊이, 表面硬度 및 內部 수축공의 變化를 관찰하였다. 耐충격, 耐마모용의 最適化學成分은 C3.4∼4%이고 Si 0.6% 였으며 볼 내부에 발생하는 shrinkage cavity는 칠의 깊이가 깊어짐에 따라 中心 가까이 位置함을 규명할 수 있었다. This research aims to find out the temperature range of the chilled ball metal mold, 170℃∼250℃ for sound surface in chilled ball casting, and to observe the depth of chill, surface hardness and Shrinkage cavity situation in ball according to chemical composition variety within this temperature range, the optimum chemical composition range for wear found to be C 3.4∼4.0%, Si 0.6% shrinkage cavity in ball has a tendency to situate at center of ball when the chill depth is deep.