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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.5; Jul 7-11, 2003; Leganes, Madrid, Spain >SOME ASPECTS OF WELDABILITY AND JOINTABILITY OF DUPLEX STAINLESS STEELS
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SOME ASPECTS OF WELDABILITY AND JOINTABILITY OF DUPLEX STAINLESS STEELS

机译：双相不锈钢的可焊性和可焊性的某些方面

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Welding and joining of stainless steels, in particular of duplex stainless steels (DSS), has been one of the research lines of the Welding and Joining Group at Metallurgical and Materials Engineering Department in University of Sao Paulo since 1992. This paper is a brief report on the work done in this subject up to 2002. Weldability studies of multipass welding at low temperature HAZ (LTHAZ) as well as at high temperature HAZ (HTHAZ) and FZ (fusion zone) were conducted on samples of UNS S 32304, UNS S31803, UNS S 32550, UNS S32750 and UNS 32760 DSS. Microstructure, mechanical and corrosion properties in simulated (dilatometer and or Gleeble~(~R) equipment) and real welds were characterized using different techniques and tests. Intermetallic phase precipitation (sigma phase and chromium nitride) and secondary austenite were characterized and a model for secondary austenite precipitation in multipass welding of HTHAZ was proposed. Simulated samples were compared to real welds to validate the multipass thermal model and presented a very good agreement between them. Consequently the phase transformations studied by simulated samples represent real weld microstructure. The behavior of multipass FZ using filler metals (AWS E2259-17 and EN 25 9 4L) was also addressed. Intermetallic precipitation diagrams were determined for both filler metals and two DSS to compare reheated weld metal regions for three different welding procedures. The crescent heat input technique presented the best results. Brazeability of UNS S31803 DSS was also considered. Experiments were carried out in a hydrogen continuous furnace using three different nickel based filler metals (AWS BNi-1, BNi-2 and BNi-7). Several brazing conditions were tested using different brazeability tests such as the sessile droplet test, the edge test, and the capillary raise test. Best wetting and spreading results were obtained for BNi-7 for the equipment used in the experiment, but brazing thermal cycling in such furnace impaired base metal corrosion resistance due to intermetallic phase precipitation.
机译：自1992年以来，不锈钢，特别是双相不锈钢（DSS）的焊接与连接一直是圣保罗大学冶金与材料工程系焊接与连接小组的研究项目之一。本文为简要报告。直到2002年为止在此主题上所做的工作。对UNS S 32304，UNS S31803的样品进行了低温HAZ（LTHAZ）以及高温HAZ（HTHAZ）和FZ（熔合区）的多道焊接的可焊性研究。 ，UNS S 32550，UNS S32750和UNS 32760 DSS。使用不同的技术和测试对模拟（膨胀计和/或Gleeble〜（〜）设备）和实际焊缝中的显微组织，机械性能和腐蚀性能进行了表征。表征了金属间相的析出（σ相和氮化铬）和二次奥氏体，并提出了HTHAZ多道次焊接中二次奥氏体析出的模型。将模拟样品与真实焊缝进行比较，以验证多道次热模型，并在它们之间表现出很好的一致性。因此，由模拟样品研究的相变代表了真实的焊接组织。还解决了使用填充金属（AWS E2259-17和EN 25 9 4L）进行多通道FZ的行为。确定了填充金属和两个DSS的金属间沉淀图，以比较三种不同焊接程序的再热焊接金属区域。新月热输入技术显示了最佳结果。还考虑了UNS S31803 DSS的钎焊性。实验是在氢连续炉中使用三种不同的镍基填充金属（AWS BNi-1，BNi-2和BNi-7）进行的。使用不同的钎焊性测试（例如无固定液滴测试，边缘测试和毛细升高测试）测试了几种钎焊条件。对于实验中使用的设备，BNi-7的润湿和铺展效果最佳，但是由于金属间相的析出，这种炉中的钎焊热循环削弱了贱金属的耐腐蚀性。

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