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加载频率和超载对腐蚀疲劳裂纹起始寿命的影响

王荣 , 郑修麟

中国腐蚀与防护学报

研究了加载频率和超载对ＬＹ１２ＣＺ铝合金切口件在３．５％ＮａＣｌ溶液中腐蚀疲劳裂纹起始（ＣＦＣＩ）寿命的影响。结果表明，当加载频率ｆ≥１Ｈｚ时，频率对ＣＦＣＩ寿命无显著影响；拉伸超载显著延长铝合金ＣＦＣＩ寿命。超载延寿效应的程度取决于由超载引起的切口根部局部应变值。依据实验结果与分析，给出反映超载影响的ＣＦＣＩ寿命表达式，并对超载延寿效应的机制进行了探讨。

关键词: 腐蚀疲劳 , Crack initiation , Load frequency , Tension overload , Aluminum alloy

A Hybrid Joining Technology for Aluminum/Zinc Coated Steels in Vehicles

C.Y. Choi D.C. Kim D.G. Nam Y.D. Kim Y.D. Park

材料科学技术（英）

Currently, in the automotive industry, joining of the aluminum alloys with the steel is a crucial problem to be solved. Conventional joining techniques including resistance spot and gas metal arc welding are not acceptable for those applications due to a number of metallurgical problems. The investigation was carried out to develop the hybrid joining process combining the resistance spot welding and brazing. In this study, an attempt was made to apply hybrid process to the joining of dissimilar sheet metals, Al-Mg-Si (6000 series) alloy and low carbon steel sheet. Hybrid process (resistance spot weld/brazing) using filler metal was found to be effective to overcome the incompatibility between aluminum alloy and steel. Although hybrid joining process of Al alloy sheet and steel sheet did not produce acceptable bond strength, it was proved to have reasonable interfacial
bond layer if the optimal process condition was applied.

关键词: Hybrid joining , Aluminum , Steel , Welding

A Hybrid Joining Technology for Aluminum/Zinc Coated Steels in Vehicles

C.Y. Choi D.C. Kim D.G. Nam Y.D. Kim Y.D. Park

材料科学技术（英）

Currently, in the automotive industry, joining of the aluminum alloys with the steel is a crucial problem to be solved. Conventional joining techniques including resistance spot and gas metal arc welding are not acceptable for those applications due to a number of metallurgical problems. The investigation was carried out to develop the hybrid joining process combining the resistance spot welding and brazing. In this study, an attempt was made to apply hybrid process to the joining of dissimilar sheet metals, Al-Mg-Si (6000 series) alloy and low carbon steel sheet. Hybrid process (resistance spot weld/brazing) using filler metal was found to be effective to overcome the incompatibility between aluminum alloy and steel. Although hybrid joining process of Al alloy sheet and steel sheet did not produce acceptable bond strength, it was proved to have reasonable interfacial
bond layer if the optimal process condition was applied.

关键词: Hybrid joining , Aluminum , Steel , Welding

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