2091Al-Li合金TIG焊焊接接头组织与强度

研究了２０９１Ａｌ－Ｌｉ合金ＴＩＧ焊焊接接头焊态及不同热处理状态下的显微组织和拉伸性能。结果表明：在焊态焊缝区已存在少量细小的沉淀强化相δ′相，但由于其体积分数小，沉淀强化作用弱，此时固溶强化为主要强化机制，接头强度较低，接头强度系数为６４％。焊后经人工时效处理，由于有大量的沉淀强化相δ′和ｓ′相析出，沉淀强化作用强，接头强度有明显提高，接头强度系数可达８９％。焊后经固溶处理加人工时效，沉淀强化相分布均匀，尺寸适中，接头强度大大提高，接头强度系数高达９８％。

Strength and microstructure of 2091 Al-Li alloy TIG welded joint

The microstructure and tensile properties of TIG welding joints of 2091 Al Li alloy were investigated both in as welded and different postweld heat treatment condition. The results show that solution strengthening played an important role in the as welded condition, though the precipitation strengthening δ′ phase formed already in the as welded weld metal, but its effect was not apparent due to the lower volume fraction of δ′ phase. So the strength coefficient ( φ ) of the welded joint/base metal was 64%. After artificially aging heat treatment, the precipitation strengthening effect increased much due to the formation of more δ′ phase and s′ phase. Its φ value was increased up to 89%. The highest strength of the welded joints was obtained after solid solution and then artificially aged heat treatment. Due to the proper size of precipitation strengthening phases and their well distribution, the φ value was increased up to 98%.

水泥窑尾高温风机的焊接变形及其控制

1 焊接设备及材料采用手工电弧焊。母材为引进材料,符合英国标准BS1501-281BLT40,属合金耐热钢。采用与母材相匹配的专用焊条,直流反接施焊。 2

热循环峰值温度对2091Al－Li合金焊接HAZ显微组织和拉伸性能的影响

研究了焊接热循环峰值温度对２０９ｌＡｌ－Ｌｉ合金焊接ＨＡＺ显微组织和拉伸性能的影响。采用热模拟机模拟ＨＡＺ焊接热循环，对模拟试件进行拉伸试验、显微组织观察及断口分析。结果表明：随着峰值温度上升，焊接ＨＡＺ强度下降，而延伸率增高。