罗 震 ,武钰栋 ,马成勇,齐彦昌 ,张 禹
AuthorsHTML:罗 震 ^{1, 2}，武钰栋 ^{1, 2}，马成勇 ³ ，齐彦昌 ³ ，张 禹 ^{1, 4}
AuthorsListE:Luo Zhen ,Wu Yudong,Ma Chengyong ,Qi Yanchang ,Zhang Yu
AuthorsHTMLE:Luo Zhen ^{1, 2}，Wu Yudong^{1, 2}，Ma Chengyong ³，Qi Yanchang ³，Zhang Yu^{1, 4}
Unit:1. 天津大学材料科学与工程学院，天津 300072；
2. 天津大学天津市现代连接技术重点实验室，天津 300072；
3. 钢铁研究总院，北京 100081，4. 清华大学机械工程系，北京 100084

Unit_EngLish:1. School of Materials Science and Engineering，Tianjin University，Tianjin 300072，China；
2. Tianjin Key Laboratory of Advanced Joining Technology，Tianjin University，Tianjin 300072，China；
3. General Iron and Steel Research Institute，Beijing 100081，China；
4. Department of Mechanical Engineering，Tsinghua University，Beijing 100084，China

Abstract_Chinese:对合金元素有差异的两类镍基焊条实验，发现镍基焊条熔敷金属的显微组织均由γ相树枝晶组成．熔敷金 属硬度在焊根和表面有差异，在焊根处硬度较大．镍基焊条熔敷金属在拉伸过程中容易发生形变诱导相变，诱导原 来 fcc 的γ相，生成 bcc 组织．通过该机制，Cr 含量高的熔敷金属表现出良好的塑性和静力韧度，拉伸实验中，其 拉伸断口的形貌为韧窝特征，但是在低温冲击实验中，其低温冲击韧性较差．Cr 含量低的熔敷金属塑性较差，拉伸 实验断口形貌为韧窝和解理混合特性，其低温冲击性能优于 Cr 含量高的熔敷金属．
Abstract_English:The microstructure of the metal deposited at a Ni-based electrode is composed of the dendritic gamma crystal phase. The deposited metal at the weld root is harder than that at the surface. In the process of stretching，Ni-based electrode-deposited metal is prone to deformation-induced phase transition to the gamma phase of the original fcc and the generation of bcc tissue. Via this mechanism，deposited metal with a high Cr content shows good plasticity and static toughness. In a tensile test，the tensile fracture morphology is characterized by dimples，but in a low-temperature impact test，its low-temperature impact toughness is poor. Weld metal with a low Cr content has poor plasticity，its fracture morphology in a tensile test is characterized by dimples and dissociation mixing，and its impact property at low temperature is better than that of the deposited metal with a high Cr content.
Keyword_Chinese:Ni 基焊条；合金元素；静力韧度；塑性和韧性；形变诱导相变
Keywords_English:Ni-based electrode；alloy element；static toughness；plasticity and toughness；deformation-induced phase transition

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