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首页> 外文期刊>Materials Science Research International >Solid State Diffusion Bonding of Superplastic Duplex Stainless Steel with Carbon Steel
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Solid State Diffusion Bonding of Superplastic Duplex Stainless Steel with Carbon Steel

机译：超塑性双相不锈钢与碳钢的固相扩散结合

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摘要

Solid state bonding between superplastic duplex stainless steel with carbon steel under low pressures is studied for the objectives to understand bonding behaviors and to determine mechanisms controlling bonding through the activation energy analysis. Experiments were carried out by combining several bonding parameters such as bonding temperatures, bonding pressures and surface roughness. Bond quality was evaluated by its tensile strength. Bonding strength increased with temperature, time and pressure but decreased with surface roughness. Sound bonds comparable to that of the parent metal were obtained at considerably short bonding time and low pressure. The best bonding condition obtained in this study was 1373 K temperature, 3 MPa pressure, 0.32 μm R_(max) and 220 s bonding time, producing the parent metal strength with around 1 % of deformation ratio. Changes in microstructures and hardness were observed across the bonding interface, due to diffusion of atoms, mainly C, from the carbon steel side to the duplex stainless steel side. A hard carburized layer formed at the DSS side and a soft decarburized layer at the carbon steel side. From the value of activation energy and experimental data, bonding was controlled mainly by two mechanisms, which were the superplastic deformation at the early stage and the diffusion of carbon at the second stage.
机译：研究了超塑性双相不锈钢与碳钢在低压下的固态结合，旨在了解结合行为并通过活化能分析确定控制结合的机制。通过结合几个键合参数（例如键合温度，键合压力和表面粗糙度）进行实验。通过其抗张强度评价粘合质量。粘合强度随温度，时间和压力而增加，但随表面粗糙度而降低。在相当短的结合时间和低压下获得了与母体金属相当的牢固结合。在这项研究中获得的最佳粘结条件是1373 K温度，3 MPa压力，0.32μmR_（max）和220 s粘结时间，产生的母体金属强度约为1％的变形率。由于原子（主要是C）从碳钢侧到双相不锈钢侧的扩散，在整个粘结界面上观察到了微观结构和硬度的变化。在DSS侧形成硬质渗碳层，在碳钢侧形成软质脱碳层。从活化能的值和实验数据来看，键合主要受两种机制控制，即早期的超塑性变形和第二阶段的碳扩散。

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