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首页> 外文期刊>Metals and Materials International >Formation of Secondary Phases and Their Effect on the Mechanical Properties of Joints Formed by TLP Bonding Using Fe-B-Si Insert Metal in Duplex Stainless Steel
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Formation of Secondary Phases and Their Effect on the Mechanical Properties of Joints Formed by TLP Bonding Using Fe-B-Si Insert Metal in Duplex Stainless Steel

机译：二次相的形成及其对通过双相不锈钢Fe-B-Si插入金属的TLP粘合形成的接头机械性能的影响

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摘要

We studied the effects of secondary phases on the mechanical properties of joints formed by transient liquid-phase bonding in nitrogen-containing duplex stainless steel UNS S32750. Transient liquid-phase bonding was carried out using Fe-B-Si amorphous insert metal over the temperature range of 1423-1473K for 0-1000s under a vacuum of 5x10(-5)Torr. Area fraction of austenite () in the joint region decreased with increasing bonding temperature and holding time. In particular, when the holding time was sufficiently prolonged, phase-depleted region were observed in the base metal adjacent to the joint. Secondary phases formed at the joint after short holding times were predominantly chromium borides. For specimens bonded with longer holding times (up to 1000s), boron nitrides were formed at the interface with the joint. Formation of secondary phases in a joint area during the bonding process was expressed by diffusion equation. Tensile strength was improved in accordance with increase of bonding temperature and holding time. Especially, the bonding efficiency was over 98% for the specimen held for 1000s at 1473K. Tensile strength of the joint after short holding times was affected by brittle residual eutectic constituents and borides, whereas tensile strength after longer holding time was influenced by boron nitride formed at the joint interface. The results showed that the mechanical properties were strongly related to the secondary phases (CrB, BN) formed during the bonding process.
机译：我们研究了二次相对含氮双相不锈钢Unt S32750中透气液相键合形成的关节力学性能的影响。在5×10（-5）托的真空下，在1423-1473K的温度范围内的Fe-B-Si无定形插入金属在5×10（-5）托的真空下进行瞬态液相键合。接合区域中的奥氏体（）的面积分数随着粘接温度和保持时间的增加而降低。特别地，当保持时间足够延长时，在与关节相邻的基础金属中观察相位耗尽的区域。在短暂保持时间后形成的次级相位主要是硼化铬。对于与较长保持时间（最多1000秒）粘合的标本，在与接头的界面处形成氮化硼。通过扩散方程表示在粘合过程中形成接合区域中的次级相。根据键合温度和保持时间的增加，改变拉伸强度。特别是，在1473K时，样品粘合效率超过98％。短暂保持时间后关节的拉伸强度受到脆性残留的共晶成分和硼化物的影响，而较长保持时间后的拉伸强度受关节界面中形成的氮化硼的影响。结果表明，在粘合过程中形成的二次相（CRB，BN）强烈相关的力学性能。

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