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首页> 外文期刊>Transactions of the Indian Institute of Metals >Effect of Grain Size on the Mechanical Properties of Aluminum Alloy AA2219 Parent and Weldments at Ambient and Cryogenic Temperature
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Effect of Grain Size on the Mechanical Properties of Aluminum Alloy AA2219 Parent and Weldments at Ambient and Cryogenic Temperature

机译：晶粒尺寸对环境和低温温度铝合金AA2219母材机械性能的影响

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摘要

Aluminum alloy AA2219 is used for the fabrication of the liquid hydrogen (fuel, boiling point 20K) and liquid oxygen (oxidizer, boiling point 90K) propellant tanks of cryogenic engine in view of its good weldability, compatibility with propellants and excellent mechanical properties at the operating temperatures. The propellant tanks are fabricated using fine-grained thin sheet/plate, roll bent to form cylindrical shells and are welded to large coarse-grained intermediate/end seamless ring-rolled products. The integrity of the weld joints and the mechanical properties need to be ascertained for the joints with coarse- and fine-grained microstructures to demonstrate the safety margins on the tank design. Therefore, detailed experiments were conducted to study the effect of grain size and grain aspect ratio on the mechanical properties of AA 2219 parent and weld specimens, at both ambient and cryogenic temperatures. It was found that reliable joints could be fabricated and there was no significant effect of grain size or aspect ratio on the mechanical properties of weld joints either at room temperature (300K) or at 77K.
机译：铝合金AA2219用于制造液体氢气（燃料，沸点20K）和液氧（氧化剂，沸点90K）的低温发动机推进剂罐，鉴于其良好的可焊性，与推进剂的相容性和优异的机械性能工作温度。推进剂罐用细粒薄片/板制造，弯曲以形成圆柱形壳，并焊接到大粗粒中间/端无缝环轧制产品。焊接接头的完整性和机械性能需要确定具有粗糙和细粒细胞微结构的关节，以展示罐设计的安全边缘。因此，进行了详细实验以研究晶粒尺寸和谷粒纵横比在环境和低温温度下对AA 2219母体和焊接标本的机械性能的影响。发现可以制造可靠的关节，并且在室温（300k）或77k时，焊接接头的机械性能没有显着影响。

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