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首页> 外文期刊>Welding Research Council Bulletin >Ferrite Determination in Stainless Steel Welds - Advances since 1974 - Developments over the last 20 years have extended Ferrite Number determinations to duplex ferritic-austenitic stainless steel weld metals
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Ferrite Determination in Stainless Steel Welds - Advances since 1974 - Developments over the last 20 years have extended Ferrite Number determinations to duplex ferritic-austenitic stainless steel weld metals

机译：不锈钢焊缝中铁素体的确定-1974年以来的发展-过去20年的发展将铁素体号的确定范围扩展到了双相铁素体-奥氏体不锈钢焊缝金属

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摘要

Since the Comfort A. Adams Lecture of W. T. DeLong in 1974, significant advances in the determination of ferrite content in stainless steel welds have taken place. These are reviewed in the present Comfort A, Adams Lecture. Examination of MagneGage Number 3 Magnet strengths led to a concept for extending, by extrapolation, the calibration range of AWS A4.2-74 to ferrite levels above 28 FN. Ferrite Numbers could then be assigned to thinner coating thickness standards for primary calibration of MagneGages over the extended range. Round robin studies were conducted to establish the reproducibility of measurement of Ferrite Numbers in duplex stainless steel welds. The method was incorporated into ANSI/AWS A4.2-91. Calibration using primary standards (coating thickness standards) is limited to a very few instruments, due to the difference in distribution of ferromagnetic material in coating thickness standards vs. that in stainless steel weld metal. Sec-ondary standards, covering the range from near zero to about 100 FN, became available for calibrating additional instruments at the beginning of 1995. A round robin of tests established that the interlaboratory reproducibility of measurement after calibration by the secondary standards is similar to that observed with MagneGages calibrated by use of primary standards. Excessive ferrite in duplex stainless steel weld metals has adverse effects on weld properties. The utility of the Ferrite Number measurement system for duplex stainless steels is thus established. Development of a solid link between Ferrite Number and ferrite percent, determination of ferrite in the heat-affected zone (HAZ) of duplex stainless steel weld-ments, and further development of predicting diagrams remain for the future.
机译：自1974年W. T. DeLong的Comfort A. Adams演讲以来，在确定不锈钢焊缝中铁素体含量方面取得了重大进展。这些在当前的舒适A，亚当斯演讲中进行了回顾。对3号MagneGage磁体强度的检验导致了一个概念，即通过推断将AWS A4.2-74的校准范围扩展到28 FN以上的铁素体水平。然后，可以将铁素体编号分配给较薄的涂层厚度标准，以便在扩展范围内对MagneGages进行初步校准。进行了循环研究，以建立双相不锈钢焊缝中铁素体数的测量可重复性。该方法已合并到ANSI / AWS A4.2-91中。由于铁磁材料在涂层厚度标准中与不锈钢焊缝金属中分布的差异，使用主要标准（涂层厚度标准）进行校准仅限于极少数仪器。涵盖从零到大约100 FN范围的二次标准，从1995年初开始可用于校准其他仪器。一轮测试表明，二级标准校准后的实验室间测量重现性与之相似。通过使用主要标准品校准的MagneGages观察到。双相不锈钢焊接金属中铁素体过多会对焊接性能产生不利影响。这样就建立了用于双相不锈钢的铁素体数测量系统的实用性。在铁素体数与铁素体百分比之间建立牢固的联系，确定双相不锈钢焊件热影响区（HAZ）中的铁素体，并进一步发展预测图。

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