GH2132合金环缝结构件裂纹敏感性研究

发布时间：2018-01-27 16:08

本文关键词： GH TIG焊环缝液化裂纹残余应力　出处：《焊接》2017年10期 　论文类型：期刊论文

【摘要】：针对轴承座底盘与螺柱TIG焊环缝结构,对不同硼含量的GH2132合金进行焊接工艺试验,检测焊接接头表面及横截面裂纹,结合接头显微组织形貌及XRD残余应力测试结果分析裂纹形成机理。结果表明,GH2132合金底盘与螺柱TIG焊接头具有焊接裂纹敏感性,裂纹出现在熔合线附近的粗晶区,沿晶界向母材扩展,为液化裂纹。焊接接头裂纹敏感性随焊接热输入的增大而增大,合金中硼元素含量对液化裂纹敏感性有较大影响,含硼高的合金裂纹敏感性高于含硼低的合金。焊接接头裂纹的分布与该构件结构特征密切相关。由于轴承座底盘有一个中心孔且螺柱靠近中心孔的边缘,焊接时螺柱外侧焊缝受到的拘束应力大于其内侧焊缝,裂纹多出现在螺柱环形焊缝的外侧。
[Abstract]:Aiming at the circumferential structure of TIG welding of bearing chassis and stud, the welding process test of GH2132 alloy with different boron content was carried out to detect the surface and cross section cracks of welded joints. The crack forming mechanism was analyzed by combining the microstructure of the joint and the residual stress of XRD. The results showed that the weld crack sensitivity of the TIG welding joint between the chassis and stud of HGH2132 alloy was found to be sensitive to the welding crack. The crack appears in the coarse-grained area near the fusion line and propagates to the base metal along the grain boundary, which is a liquefied crack. The crack sensitivity of the welded joint increases with the increase of the welding heat input. The content of boron in the alloy has great influence on the susceptibility of liquefied crack. The crack sensitivity of the alloy with high boron content is higher than that of the alloy with low boron content. The distribution of cracks in welded joints is closely related to the structural characteristics of the member. Because there is a central hole in the bearing chassis and the stud is close to the edge of the central hole. The restraint stress on the outside weld of the stud is greater than that on the inside of the stud, and the cracks occur mostly on the outside of the annular weld of the stud.
【作者单位】：南昌航空大学轻合金加工科学与技术国防重点学科实验室;中国南方航空工业(集团)有限公司;
【分类号】：TG407
【正文快照】： 2.中国南方航空工业(集团)有限公司,湖南株洲412002)0序言现代航空发动机中,高温合金的重量占航空发动机重量的70%以上,几乎完全用镍基合金来制造涡轮叶片,用镍基或铁基合金来制造涡轮盘[1]。GH2132合金为时效强化型铁镍基高温合金,具有较高的高温强度和良好的加工性能,广泛应

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