Pulsed electric current joining of oxide-dispersion-strengthened austenitic steels
Pulsed electric current joining of oxide-dispersion-strengthened austenitic steels
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DOI：
10.1007/s10853-021-06495-9
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发表时间：
2021-09
影响因子：
4.5
通讯作者：
Fei Wang;Xueliang Yan;Xin Chen;Nathan M. Snyder;M. Nastasi;K. Hattar;B. Cui
中科院分区：
文献类型：
--
作者：
Fei Wang;Xueliang Yan;Xin Chen;Nathan M. Snyder;M. Nastasi;K. Hattar;B. Cui
采用脉冲电流焊接工艺实现了氧化物弥散强化（ODS）奥氏体钢的固态连接。奥氏体晶粒组织和氧化物分散在接头区域的微观结构，其特征在于使用电子显微镜。在奥氏体晶粒结构中观察到可忽略的晶粒生长，而氧化物分散体在短的保持时间内发生轻微粗化。PECJ工艺的机制可能涉及同时发生的三个步骤，包括粘结层中机械合金化粉末的烧结、氧化物分散体的形成以及机械合金化粉末与基体合金的粘结。接头区保持了ODS合金的高硬度和耐辐照性能。该研究揭示了PECJ过程的基本机理，这有利于其在ODS合金先进制造中的潜在应用。
The solid-state joining of oxide-dispersion-strengthened (ODS) austenitic steels was achieved using a pulsed electric current joining (PECJ) process. Microstructures of the austenitic grain structures and oxide dispersions in the joint areas were characterized using electron microscopy. Negligible grain growth was observed in austenitic grain structures, while slight coarsening of oxide dispersions occurred at a short holding time. The mechanisms of the PECJ process may involve three steps that occur simultaneously, including the sintering of mechanical alloying powders in the bonding layer, formation of oxide dispersions, and bonding of the mechanical alloying powders with the base alloy. The high hardness and irradiation resistance of ODS alloys were retained in the joint areas. This research revealed the fundamental mechanisms during the PECJ process, which is beneficial for its potential applications during the advanced manufacturing of ODS alloys.