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分别采用不同的钎焊温度和时间对硬质合金和合金钢异种材料进行真空钎焊,并对接头截面形貌进行了观察,对拉剪强度和显微硬度进行了检测。结果表明,当钎焊温度小于1055℃时,随着钎焊温度的升高,过渡区越宽,拉剪强度逐渐升高,断裂位置均是位于硬质合金一侧,焊缝区的平均显微硬度逐渐提高,当温度达到1055℃时,钎缝厚度有所减小,钎焊焊缝及界面区域出现了较多的孔洞,拉剪强度降低,焊缝硬度几乎不变;当钎焊时间小于16min时,随着钎焊时间的延长,过渡区越宽,拉剪强度逐渐升高,断裂位置均是位于硬质合金一侧,焊缝区的平均显微硬度逐渐提高,当时间达到16min时,钎缝厚度有所减小,钎焊焊缝及界面区域出现了较多的孔洞,拉剪强度几乎不变,焊缝硬度明显降低。
Different brazing temperature and time were used to braze the dissimilar materials of cemented carbide and alloy steel respectively. The cross section of the joint was observed and the tensile strength and microhardness were tested. The results show that when the brazing temperature is less than 1055 ℃, with the increase of brazing temperature, the transition zone is wider and the tensile strength is gradually increased. The fracture locations are all located on the cemented carbide side. Microhardness gradually increased, when the temperature reaches 1055 ℃, the brazing seam thickness decreases, brazing weld and interface area appear more holes, tensile shear strength decreases, the weld hardness almost unchanged; when the brazing time Less than 16min, with the extension of brazing time, the transition zone wider, the tensile shear strength gradually increased, the fracture location are located on the cemented carbide side, the average microhardness of the weld zone gradually increased, when the time reached 16min , The thickness of the braze seam is reduced, more holes appear in the brazing seam and interface area, the tensile strength is almost unchanged, and the weld hardness is obviously reduced.