| La2O3对MGH956合金TIG焊焊缝组织和性能的影响 |
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| 引用本文： | 雷玉成,赵凯,黄巍,梁申勇. La2O3对MGH956合金TIG焊焊缝组织和性能的影响[J]. 焊接学报, 2013, 0(10): 1-4 |
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| 作者姓名： | 雷玉成 赵凯 黄巍 梁申勇 |
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| 作者单位： | 江苏大学材料科学与工程学院, 镇江 212013,江苏大学材料科学与工程学院, 镇江 212013,江苏大学材料科学与工程学院, 镇江 212013,江苏大学材料科学与工程学院, 镇江 212013 |
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| 基金项目： | 国家自然基金资助项目(51075191);江苏省高校博士创新基金资助项目(CXZZ11_0556);江苏大学科技创新团队资助项目(JD0805);江苏高校优势学科建设工程资助项目 |
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| 摘 要： | 为了研究La2O3对焊缝组织和性能的影响,分别以未填加、填加2%和4%La2O3的填充材料对MGH956合金进行TIG焊接,应用光学显微镜、扫描电镜和透射电镜对焊缝的微观组织和拉伸断口进行观察,同时测试焊缝的抗拉强度.结果表明,适当提高La2O3含量,可以使焊缝晶粒得到细化,填加2%La2O3的焊缝晶粒最细小均匀,焊缝中的颗粒相增多且分布均匀,强化机制是由细晶强化和Orowan强化共同作用,但当La2O3加入量达到4%时,发现颗粒相有团聚现象,强化主要由位错塞积引起.填加2%La2O3的焊缝抗拉强度最大,为628 MPa,拉伸断口为韧-脆混合断裂.
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| 关 键 词： | MGH956合金 TIG焊 组织 力学性能 |
| 收稿时间： | 2012-08-09 |
Effect of La2O3 on microstructure and mechanical properties of MGH956 alloy during TIG welding |
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| LEI Yucheng,ZHAO Kai,HUANG Wei and LIANG Shenyong. Effect of La2O3 on microstructure and mechanical properties of MGH956 alloy during TIG welding[J]. Transactions of The China Welding Institution, 2013, 0(10): 1-4 |
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| Authors: | LEI Yucheng ZHAO Kai HUANG Wei LIANG Shenyong |
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| Affiliation: | School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China,School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China,School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China and School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China |
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| Abstract: | In order to study the effect of La2O3 on joint microstructure and mechanical properties,tungsten insert gas (TIG) welding of MGH956 alloy was performed without La2O3 and with 2%,4% La2O3 as filler materials respectively. The joint microstructure and fracture surfaces were analyzed by testing method such as optical microscope(OM),scanning electron microscope( SEM) and transmission electron microscopy(TEM). Tensile strengths were also tested. The results show that grain refinement occurs in joint when the content of La2O3 increases properly. When the joint contains 2% La2O3,joint grain is the smallest and uniformly distributed,particle-phase increases and it is uniform distributed in the joint. The strengthening mechanism of joint are fine-grain strengthening and Orowan strengthening. When the content of La2O3 is 4%,particles partially agglomerate in joint. The joint is strengthened mainly by piling up of dislocations. When the joint contains 2% La2O3,tensile strength is the largest and reaches 628 MPa. The fracture surface of joint exhibites brittle-ductile mixed fracture. |
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| Keywords: | MGH956 alloy TIG welding microstructure mechanical properties |
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