激光焊接铜与不锈钢接头之间焊缝区显微组织的非均匀性

来源 :中国有色金属学报（英文版） | 被引量 : 0次 | 上传用户：litiemei101

【摘要】

：

研究激光焊接(LBW)工艺对铜(Cu)和不锈钢(SS)异种焊缝显微组织与力学性能关系的影响.采用背散射(BSE)扫描电子显微镜(SEM)成像来表征LBW(Cu-SS)焊缝的高度非均匀组织特征.BSE

【作者】

：

Saranarayanan RAMACHANDRAN A.K.LAKSHMINARAYANAN

【机构】

：

Department of Mechanical Engineering,SSN College of Engineering,Kalavakkam 603103,Tamil Nadu,India

【出处】

：

中国有色金属学报（英文版）

【发表日期】

：

2020年3期

【关键词】

：

激光焊接铜不锈钢显微组织表征拉伸性能冲击韧性

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研究激光焊接(LBW)工艺对铜(Cu)和不锈钢(SS)异种焊缝显微组织与力学性能关系的影响.采用背散射(BSE)扫描电子显微镜(SEM)成像来表征LBW(Cu-SS)焊缝的高度非均匀组织特征.BSE分析充分证明在异种焊接界面和熔合区产生复杂的显微组织.沿铜/焊缝界面存在明显的晶粒生长差异:从粗柱状晶到等轴状超细晶.高分辨电子背散射衍射(EBSD)分析证实铜/焊缝界面存在晶粒细化机制.拉伸和冲击试验结果表明,异种焊缝的拉伸和冲击性能与铜基体的基本一致.在熔合区和铜/焊接界面区等非均匀材料成分区,存在明显的显微硬度梯度.为了全面了解局部焊缝亚区的组织与性能的关系,确定出焊缝亚区的异质形核点,并与显微硬度测试结果相互关联.

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激光焊接铜与不锈钢接头之间焊缝区显微组织的非均匀性

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