Effects of Ni/V Addition on Microstructure and High Temperature Mechanical Properties of Ductile Irons

• Main Authors: Jia-Wei Chen, 陳嘉偉
• Other Authors: 唐自標
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/p8rf37

碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 99 === The research is mainly to discuss the effects of Ni/V complex addition on microstructure and High-temperature(800℃) mechanical properties of ductile irons. Add individual nickel, vanadium into the ductile iron and finally take a alloying variable to made of composite alloys.To be aimed at different adding amount of nickel , vanadium and Ni/V alloys,they can be proceeded the analyses of metallization, hardness, impact test, tensile strength and tensile fracture surface,and discuss the effect of different adding amount of alloy on the strength of ductile irons. According to the the test results, Add the vanadium alloy, mechanical properties at room temperature, tensile strength increased with the vanadium content on the rise, the best tensile strength is 640 MPa of 0.7wt%V and the hardness is HB 282.Opposite of the impact energy was falling. The both of high-temperature tensile strength and impact energy have the best values with 0.5wt% vanadium. the best tensile strength is 63.3 MPa and the best impact energy is 65 J/cm2. On the other hand the nickel alloy, the room temperature and high temperature tensile strength with 18% Ni are the best. The room temperature tensile strength is 498 MPa and high temperature tensile strength is 131 MPa, the hardness is HB 198. The Impact energy to 22%Ni is best at room temperature and high temperature the values were 70 J/cm2 and 159 J/cm2.The composite alloys (22wtNi%-0.5wt%V), room temperature and high temperature tensile strength of its values were 448 MPa and133 MPa. Room temperature and high temperature impact energy of its values were 74 J/cm2 and 124 J/cm2.