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鋁合金表面激光熔覆Fe-Al青銅過渡區(qū)的組織結(jié)構(gòu)及其在小能多沖作用下的行為
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TG156.99

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高等學(xué)校博士點(diǎn)學(xué)科專項(xiàng)科研基金


Microstructure and Multiple-Impact Response of the Transition Region Between a Laser-Clad Fe-Al Bronze Coating and Its Aluminum Alloy Substrate
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    摘要:

    研究了Al－Si合金表面激光熔覆Fe－Al青銅合金過渡區(qū)的組織和相結(jié)構(gòu)；探討了在小能量多沖作用下過渡區(qū)的行為。結(jié)果表明：熔覆層／基材間過渡區(qū)的組織和相結(jié)構(gòu)存在一定的層次，靠近熔覆層的一側(cè)為不均勻的塊狀Cu9Al4＋Cu3Al；中間區(qū)為塊狀Cu9Al4＋針狀CuAl2；向基材靠近時(shí)，過渡區(qū)的針狀CuAl2相逐漸減少，α-Al相逐漸增多。在小能多沖作用下，過渡區(qū)裂紋形成干脆性相CUAl2富集的區(qū)域，激光掃描速度對(duì)CUAl2相在過渡區(qū)的分布厚度影響顯著，進(jìn)而影響到過渡區(qū)的抗小能多沖行為。掃描速度在10mm／s～

    Abstract:

    The microstructure and small energy multi-impact (SEMI) behavior of the transition region between a laser-clad Fe-Albronze coating and its aluminum alloy substrate have been investigated. The results show that the transition region consists of severallayers. The layer adjacent to the clad region is composed of nonuniform block-like Cu9Al4 and Cu3Al phases. The middle layer is characterized by a mixed structure of block-like Cu3Al and needle-like CuAl2. In the layer near to the substrate the volume fractivn of needle-like CuAl, phase decreases and volume fraction of a-Al phase increases when approaching to the substrate. Under SEMI loading,cracks initiate in the CuAl2, phase-rich region. Laser scanning velocity has a significant influence on the volume fraction of CuAl,phase, and thus directly affects the SEMI resistance of the transition region. The laser-clad bronze coatings produced at a scanningvefority of 10mm/s to 14 mm/s has better resistance to SEMI than those produced at higher scanning velocities.

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王愛華,謝長(zhǎng)生,李樹棟,聶繼紅.鋁合金表面激光熔覆Fe-Al青銅過渡區(qū)的組織結(jié)構(gòu)及其在小能多沖作用下的行為[J].稀有金屬材料與工程,1999,(5):289~.[Wang Aihua, Xie Changsheng, Li Shudong. Microstructure and Multiple-Impact Response of the Transition Region Between a Laser-Clad Fe-Al Bronze Coating and Its Aluminum Alloy Substrate[J]. Rare Metal Materials and Engineering,1999,(5):289~.]
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