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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Annealing on the Microstructure and Properties of Electron Beam Welded 4J34 Kovar Alloy
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Effect of Annealing on the Microstructure and Properties of Electron Beam Welded 4J34 Kovar Alloy

机译：电子束焊接4J34 Kovar合金电子束微观结构和性能的影响

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摘要

Electron beam welding of 4J34 Kovar alloy was conducted, and the microstructure and mechanical properties of the joints in as-welded and postweld annealing treatment (PWAT) states were investigated. The martensitic transformation occurred and led to the generation of lath martensite due to the rapid cooling in the as-welded condition. After annealing treatment, part of the martensite transformed to austenite and subsequently developed the bulk phase and / lamellar microstructures in the fusion zone (FZ) of the postwelded joint. Grains in the heat-affected zone (HAZ) clearly developed and penetrated into the FZ, causing the disappearance of the fusion line between the FZ and the HAZ. All the joints in both the as-welded and PWAT conditions exhibited ductile fracture. The maximum tensile strength of 505MPa was obtained in the as-welded joint with the welding speed of 150mm/min. The linear expansion coefficients of the joint and base metal decreased with the increase in temperature. However, the decreasing rate of PWAT joints was lower than that of the as-welded joints.
机译：研究了4J34 Kovar合金的电子束焊接，并研究了用焊接和焊接退火处理（PWAT）状态的关节微观结构和机械性能。由于在焊接条件下快速冷却，马氏体转化发生并导致了Lath Martensite的产生。退火处理后，部分马氏体转化为奥氏体并随后在焊接接头的融合区（FZ）中发育了堆积相和/层状微观结构。热影响区域（HAZ）的谷物清楚地发育并渗透到FZ中，导致FZ和HAZ之间的融合线消失。所有接头在焊接和PWAT条件下都表现出韧性骨折。在焊接接头中获得505MPa的最大拉伸强度，焊接速度为150mm / min。接头和基础金属的线性膨胀系数随温度的增加而降低。然而，PWAT接头的降低率低于焊接接头的速率。

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