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首页> 外文期刊>Materials Science and Engineering >Influence of microstructure on the thermo-mechanical fatigue behavior and life of vermicular graphite cast irons
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Influence of microstructure on the thermo-mechanical fatigue behavior and life of vermicular graphite cast irons

机译：显微组织对蠕墨铸铁热机械疲劳行为及寿命的影响

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摘要

Cylinder head is subjected to the combination changes of temperature and mechanical loads in service. In such harsh condition, thermo-mechanical fatigue (TMF) failure is a main problem. In this study, two kinds of vermicular graphite cast irons were selected to reveal the TMF properties and life prediction. Vermicular graphite casts with different microstructures have different ferrite cluster morphologies, which result in different fracture mechanisms. The hysteresis loops of both materials display obvious asymmetry. Hysteresis energy and mechanical strain amplitude were selected as damage parameters to determine the fatigue life. It Is found that the TMF performance of vermicular graphite cast iron with higher pearlite content is better; meanwhile, the life of TMF at different constraint ratios was also studied. Hysteretic energy related to constrain ratio is in a parabolic form, and the life of TMP decreases with the absolute value of constraint ratio increasing. Finally, the quantitative relationship between constraint ratio and TMF life was also discussed.
机译：气缸盖在使用中会经受温度和机械负载的综合变化。在这种恶劣条件下，热机械疲劳（TMF）失效是一个主要问题。在这项研究中，选择了两种蠕墨铸铁来揭示TMF性能和寿命预测。具有不同显微组织的蠕墨铸铁具有不同的铁素体簇形态，从而导致不同的断裂机理。两种材料的磁滞回线显示出明显的不对称性。选择磁滞能量和机械应变幅度作为损伤参数，以确定疲劳寿命。研究发现，珠光体含量较高的蠕墨铸铁的TMF性能较好。同时研究了不同约束比下TMF的寿命。与约束比有关的磁滞能量呈抛物线形式，随着约束比的绝对值增加，TMP的寿命缩短。最后，讨论了约束比与TMF寿命的定量关系。

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