Inconel 713LC铸造高温合金微束等离子弧焊接裂纹形成机理及抑制
TG406; 针对Inconel 713LC铸造高温合金焊接增材时热影响区易产生裂纹这一问题,采用微束等离子弧焊接技术,运用扫描电镜和能谱仪对裂纹的微观形貌、合金元素分布进行分析,探究合金热影响区焊接裂纹的形成机理,研究裂纹抑制技术.结果表明,热影响区焊接裂纹的出现主要是受焊接热输入作用晶间碳化物发生部分溶解和液化形成液相,同时晶粒受热长大推动原始晶界发生移动后与液相交汇形成更大面积的液相,晶粒及晶界中的Nb元素、Mo元素和Ti元素等合金元素向液相偏聚,液相冷却凝固后形成尺寸超过 10 μm的碳化物,在焊接热应力作用下裂纹萌生于碳化物周围并沿晶界扩展,焊接裂纹数量和尺寸均随着热输入的增大而增大...
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| Published in | 焊接学报 Vol. 45; no. 6; pp. 39 - 45 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国民航大学,天津市民用航空器适航与维修重点实验室,天津,300300
01.06.2024
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-360X |
| DOI | 10.12073/j.hjxb.20230619001 |
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| Abstract | TG406; 针对Inconel 713LC铸造高温合金焊接增材时热影响区易产生裂纹这一问题,采用微束等离子弧焊接技术,运用扫描电镜和能谱仪对裂纹的微观形貌、合金元素分布进行分析,探究合金热影响区焊接裂纹的形成机理,研究裂纹抑制技术.结果表明,热影响区焊接裂纹的出现主要是受焊接热输入作用晶间碳化物发生部分溶解和液化形成液相,同时晶粒受热长大推动原始晶界发生移动后与液相交汇形成更大面积的液相,晶粒及晶界中的Nb元素、Mo元素和Ti元素等合金元素向液相偏聚,液相冷却凝固后形成尺寸超过 10 μm的碳化物,在焊接热应力作用下裂纹萌生于碳化物周围并沿晶界扩展,焊接裂纹数量和尺寸均随着热输入的增大而增大.通过脉冲焊接降低焊接热输入,热影响区的高温停留时间变短,降低焊接过程中热影响区合金元素的偏聚,减少合金中有害碳化物的长大,抑制裂纹生成;对铸态母材进行固溶处理后,合金元素偏聚得到均匀化处理,母材硬度下降,塑性得以改善,减弱了合金元素的富集倾向,降低了焊接时的裂纹敏感性. |
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| AbstractList | TG406; 针对Inconel 713LC铸造高温合金焊接增材时热影响区易产生裂纹这一问题,采用微束等离子弧焊接技术,运用扫描电镜和能谱仪对裂纹的微观形貌、合金元素分布进行分析,探究合金热影响区焊接裂纹的形成机理,研究裂纹抑制技术.结果表明,热影响区焊接裂纹的出现主要是受焊接热输入作用晶间碳化物发生部分溶解和液化形成液相,同时晶粒受热长大推动原始晶界发生移动后与液相交汇形成更大面积的液相,晶粒及晶界中的Nb元素、Mo元素和Ti元素等合金元素向液相偏聚,液相冷却凝固后形成尺寸超过 10 μm的碳化物,在焊接热应力作用下裂纹萌生于碳化物周围并沿晶界扩展,焊接裂纹数量和尺寸均随着热输入的增大而增大.通过脉冲焊接降低焊接热输入,热影响区的高温停留时间变短,降低焊接过程中热影响区合金元素的偏聚,减少合金中有害碳化物的长大,抑制裂纹生成;对铸态母材进行固溶处理后,合金元素偏聚得到均匀化处理,母材硬度下降,塑性得以改善,减弱了合金元素的富集倾向,降低了焊接时的裂纹敏感性. |
| Abstract_FL | Aiming at the problem that the heat-affected zone of Inconel 713LC casting superalloy is prone to cracks during additive welding,this paper adopts microplasma arc welding technology,scanning electron microscope and energy dispersive spectrometer to analyze the micro-morphology of cracks and the distribution of alloy elements.The formation mechanism of cracks in the heat-affected zone is explored,and the crack suppression technology is studied.The result shows that the appearance of welding cracks in the heat-affected zone is mainly due to the dissolution and liquefaction of intergranular carbide and the formation of liquid phase under the influence of welding heat input.At the same time,the grain is heated and grown to promote the original grain boundary to move and then intersect with the liquid phase to form a larger liquid phase.Nb,Mo,Ti and other alloy elements in the grains and grain boundaries are segregated into the liquid phase.Carbides with a size of more than 10 μm are formed after cooling and solidification of liquid phase.Under the action of welding stress,cracks initiate around carbides and propagate along grain boundaries.The number and size of welding cracks increase with the increase of heat input.Reducing the welding heat input through pulse welding,the high temperature residence time in the heat-affected zone becomes shorter,the degree of elements segregation in the alloy is reduced.The growth of harmful carbides in the alloy is slowed down,and the crack formation is inhibited.After the solution treatment of the as-cast base metal,the original element segregation of the base metal are homogenized.The hardness of the base metal decreases and the plasticity is improved,which weakens the enrichment tendency of the alloying elements and reduces the crack sensitivity during welding. |
| Author | 贾鹏 薛纪远 王志平 刘昱乾 |
| AuthorAffiliation | 中国民航大学,天津市民用航空器适航与维修重点实验室,天津,300300 |
| AuthorAffiliation_xml | – name: 中国民航大学,天津市民用航空器适航与维修重点实验室,天津,300300 |
| Author_FL | LIU Yuqian JIA Peng WANG Zhiping XUE Jiyuan |
| Author_FL_xml | – sequence: 1 fullname: JIA Peng – sequence: 2 fullname: XUE Jiyuan – sequence: 3 fullname: LIU Yuqian – sequence: 4 fullname: WANG Zhiping |
| Author_xml | – sequence: 1 fullname: 贾鹏 – sequence: 2 fullname: 薛纪远 – sequence: 3 fullname: 刘昱乾 – sequence: 4 fullname: 王志平 |
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| ClassificationCodes | TG406 |
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| Copyright | Copyright © Wanfang Data Co. Ltd. All Rights Reserved. |
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| DOI | 10.12073/j.hjxb.20230619001 |
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| DocumentTitle_FL | Mechanism and inhibition of welding cracks in microplasma arc of Inconel 713LC casting superalloy |
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| Keywords | solution treatment microplasma arc 微束等离子弧 welding crack pulse welding 元素偏聚 固溶处理 焊接裂纹 脉冲焊接 element segregation |
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| Title | Inconel 713LC铸造高温合金微束等离子弧焊接裂纹形成机理及抑制 |
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