同质异种热处理状态铝合金搅拌摩擦焊接头组织与性能
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首都航天机械公司

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TG4

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Microstructure and Mechanical Properties of the FSWed JointsBetween 2219MCS Ring and 2219C10S Barrel
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    摘要:

    开展了2219MCS 叉形环和2219C10S 筒段组成的接底接头的搅拌摩擦焊工艺试验ꎬ分析了焊接
    速度、2219MCS 叉形环位置对接头组织形貌、显微硬度、力学性能的影响规律ꎮ 结果表明:2219MCS 叉形环的
    原始粗大组织晶粒导致其无论位于前进侧还是后退侧ꎬ均是整个接头的薄弱环节ꎮ 接头显微硬度呈现出典型
    的“W”型分布ꎬ叉形环一侧的热机影响区的显微硬度最低ꎮ 在焊接参数相同时ꎬ叉形环位于后退侧的力学性
    能优于其位于前进侧ꎻ当焊接速度为180~220 mm/ min 且叉形环为后退侧时ꎬ其接头综合性能最优ꎬ抗拉强度
    可达到330 MPaꎬ低温抗拉强度可达到420 MPaꎬ延伸率超过3.5%ꎬ正弯性能均可以达到180°无裂纹ꎬ但是
    2219MCS 母材开始出现裂纹ꎬ而背弯性能较差ꎬ并且背部裂纹沿着2219MCS 热机影响区一侧起裂、扩展ꎮ

    Abstract:

    An extensive investigation has been carried out on the friction stir welded butt joint consisting of a
    2219MCS ring and a 2219C10S barrelꎬ and the effect of welding speed and the location of the 2219MCS ring on the
    microstructureꎬ microhardness distribution and mechanical properties of the butt joint has been systematically analyzed
    in this paper. The results showed that the 2219MCS ring whether located in the advancing side or retracting side is the
    weak link of the joint due to the original coarse grain. The microhardness distribution of the joint showed the typical
    “W” type with the TMAZ of the 2219MCS ring the lowest. The optimized investigation results showed that the per ̄
    formance of the joint with the 2219MCS ring located in the retracting side is more than the joint with the 2219MCS
    ring located in the advancing side. When the welding speed is 180 to 220 mm/ min and the 2219MCS ring located in
    the retracting sideꎬ the room temperature mechanical strength can be up to 330 MPaꎬ the low temperature strength 420
    MPaꎬ and the ductility all more than 3.5%. The face bending angle can reach 180° without crack on the jointꎬ but
    some cracks occurred on the parent metal of the 2219MCS ring. The back bending performance is so poorꎬ and the
    crack occurred and spreaded along the TMAZ of the 2219MCS ring.

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郝云飞 毕煌圣 孙宇明 孙世烜 李延民.同质异种热处理状态铝合金搅拌摩擦焊接头组织与性能[J].宇航材料工艺,2016,46(3).

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  • 在线发布日期: 2016-11-28
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