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Toughness and wear resistance of Cr cast iron have been studied at room temperature. Toughness has been investigated by bending test. And Wear resistance teat has been done by high speed wear machine. The results are as follow; 1. Ms, and Mf temperatures of 12%Cr cast iron ate in the range of 100∼205℃ 2. From the result of bending test, it results in lower toughness of 12%Cr cast iron than that of 17% due to lower Cr content. 3. Wear resistance of 12%Cr cast iron is superior to that of 17%Cr cast iron, because it is thought that hardness of 12%Cr cast iron is higher than that of 17%Cr iron to the 4∼5 extent. 4. To improve the wear resistance of cast iron, it is important to control the amout and distribution of K₂carbide in the martrix.
Toughness and wear resistance have been studied about Al - deoxidized and Fe - Ti deoxidized low Cr - Mo steels. Results are as follows; 1. Al - deoxidized steel has included many Al₂O₃inclusion particles and crack exisits in Al₂O₃inclusion particle. 2, Tough hardness of Fe - Ti deoxidized steel and Al -deoxidized steel are similar, toughness of Fe - Ti deoxidized steel is even superior to that of Al - deoxidized steels. 3. Form the relationship between hardness and wear resistance, toughness and wear resistance, wear resistance of Fe - Ti deoxidized steel is even superior to that of Al - deoxidized steel.
低溫에서 Austenite係 stainless steel의 인성과 耐磨滅性에 關한 硏究
Toughness and wear-resistance have been studied about SUS304 and SUS316 austenitic stainless steel at low temperature(-196°C) and room temperature. Toughness has been investigated by bending test. and wear-resistance test has been built by high speed wear machine The results are as follows: 1. By Cold working, work hardening of SUS 304 stainless steel is larger than SUS316 stainless steel because a^' and εmartensite transformation of SUS 304 stainless steel by working occur larger than SUS316 stainless steel. 2. During the bending test. toughness of SUS304 stainless steel is lower than that of SUS316 stainless steel. Especially, in case of SUS304 stainless steel, toughness lower considerably at cryogenic temperature (-196°C) because S.F.E is only 18mJ / m^2, a^'-matensite and ε-martensite transformation occur, and embrittlement occur at -196°C. 3. The wear loss of specimen at low temerature (-196°C) is about one-fifth compared with the results of room temperature.