用扫描电镜、能谱仪、显微硬度计和剪切试验等方法,研究了以Cu箔为中间层的碳钢/不锈钢双金属瞬间液相扩散结合区组织性能.结果表明,以Cu箔作中间层,采用冷拔-瞬间液相扩散复合法可实现碳钢与不锈钢之间的良好冶金结合,结合区抗剪强度可达到300 MPa以上.在铜/不锈钢界面,铜液沿不锈钢奥氏体晶界扩散,形成残余"孤岛"奥氏体组织分布于铜基体中;在碳钢/铜界面,沿界面形成连续的岛状富铁相,然后呈枝晶状向铜中间层有向生长;在一定温度和时间范围内随扩散时间延长或扩散温度升高,结合区富铁相增多,结合区硬度提高,抗剪强度也进一步提高.
Composition,microstructure and performance of the transient liquid phase (TLP) diffusion bonding zone of low carbon steel/ stainless steel using Cu interlayer were examined by means of SEM and OM, EDS analysis, microhardness test and shear test. The results show that the metallurgical bond of low carbon steel and stainless steel is obtained by the process of cold-draw and TLP diffusion bonding using Cu as interlayer,and compression shearing strength of the bonding zone is over 300 MPa. At the copper/stainless steel interface, liquid copper diffuses along austenite grain boundary and forms isolated-island austenite distributed in copper matrix. On the other hand, microstructure of continuous island-form iron-rich phase forms and grow to copper matrix as pinetree form at carbon steel/copper interface. Within a specific range of temperature and time, the amount of iron-rich phase, hardness and shearing strength of bonding zone increase with increasing diffusion bonding temperature and time.
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