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首页> 外文期刊>Journal of Materials Engineering and Performance >The Influence of Chromium on Mechanical Properties of Austempered Ductile Cast Iron
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The Influence of Chromium on Mechanical Properties of Austempered Ductile Cast Iron

机译：铬对奥氏体球墨铸铁力学性能的影响

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摘要

An investigation was carried out to examine the influence of microstructure and chromium on the tensile properties and plane strain fracture toughness of austempered ductile cast iron (ADI). The investigation also examined the growth kinetics of ferrite in these alloys. Compact tension and round cylindrical tensile specimens were prepared from dectile cast iron with Cr as well as without Cr. These specimens were then given four different heat treatments to produce four different microstructures. Tensile tests and fracture toughness tests were carried out as per ASTM standards E-8 and E-399. The crack growth mechanism during fracture toughness tests was also determined. The test results indicate that yield strength, tensile strength, and fracture toughness of ADI increases with an increase in the volume fractions of ferrite, and the fracture toughness reaches a peak when the volume fractions of the ferrite are approximately 60 percent in these alloys. The Cr addition was found to reduce the fracture toughness of ADI at lower hardness levels (< 40 HRC); at higher hardness levels (>= 40 HEC), the effect of chromium on the fracture toughness was negligible. The crack growth mechanism was found to be a combination of quasi-cleavage and microvoid coalescences, and the crack trajectories connect the graphite nodules along the way.
机译：进行了调查，以研究显微组织和铬对奥氏体球墨铸铁（ADI）的拉伸性能和平面应变断裂韧性的影响。研究还检查了这些合金中铁素体的生长动力学。用含铬和不含铬的球墨铸铁制备致密拉伸和圆柱拉伸样品。然后对这些样品进行四种不同的热处理，以产生四种不同的微观结构。按照ASTM标准E-8和E-399进行拉伸试验和断裂韧性试验。还确定了断裂韧性测试过程中的裂纹扩展机理。测试结果表明，ADI的屈服强度，抗拉强度和断裂韧性随铁素体体积分数的增加而增加，当这些合金中铁素体体积分数约为60％时，断裂韧性达到峰值。发现添加铬会降低较低硬度水平（<40 HRC）时ADI的断裂韧性。在较高的硬度水平（> = 40 HEC）下，铬对断裂韧性的影响可忽略不计。发现裂纹扩展机制是准裂解和微孔聚结的组合，并且裂纹的轨迹沿路径连接石墨结节。

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