Tensile properties of a thermomechanically processed ductile iron
Tensile properties of a thermomechanically processed ductile iron
复制标题
热机械加工球墨铸铁的拉伸性能
DOI：
--
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
O. Sherby
中科院分区：
文献类型：
--
作者：
C. Syn;D. Lesuer;O. Sherby
球墨铸铁从奥氏体区(900°C到1100°C)到低于A1℃的温度连续热轧或一步锻造。使用了不同的减少量(从60%到90%以上)。测量了平行和横向于轧制方向以及横向于锻造方向的拉伸性能，包括抗拉强度和总延伸率。随着热-温加工量(HWW)的减少，拉伸塑性和强度均增加。与其他研究人员得到的结果相比，在相同的减薄范围内，本结果显示出更高的强度和延性。性能的改善与本研究给出的后处理热处理温度(600℃)低于其他研究(900℃)有关。较低的热处理温度导致铁素体+碳化物基质中的细小石墨组织，而较高的热处理温度导致无碳化物的铁素体基质中的粗大石墨组织。由于小石墨成分的存在，导致失效的延迟，导致拉伸延展性增加，同时拉伸强度也随之增加。
A ductile cast iron was continuously hot-and-warm-rolled or one-step-forged from a temperature in the austenite range (900 °C to 1100 °C) to a temperature below the A1 temperature. Various amounts of reduction were used (from 60 to more than 90 pct). Tensile properties including tensile strength and total elongation were measured along the directions parallel and transverse to the rolling direction and along the direction transverse to the forging direction. The tensile ductility and strength both increase with a decrease in the amount of hot-and-warm working (HWW). Compared with the results obtained by other investigators, the present results showed higher strengths and ductilities over the same range of reduction in thickness. The improvement in properties is related to the lower temperature of the postprocessing heat treatment given in this study (600 °C) compared to other studies (900 °C). The low temperature of heat treatment leads to a structure of fine graphite in a matrix of ferrite and carbides, whereas the high temperature of heat treatment leads to coarse graphite in a matrix of carbide-free ferrite. The delay in failure from the presence of the small graphite constituent results in an increase in tensile ductility with an accompanying increase in tensile strength.