Evaluation of microstructures in 2.25Cr-1Mo and 9Cr-1Mo steel weldments using magnetic Barkhausen noise
Evaluation of microstructures in 2.25Cr-1Mo and 9Cr-1Mo steel weldments using magnetic Barkhausen noise
复制标题
DOI：
10.1016/s0921-5093(97)00040-3
复制
发表时间：
1997-07-15
期刊：
影响因子：
6.4
通讯作者：
Raj, B
中科院分区：
文献类型：
--
作者：
Moorthy, V;Vaidyanathan, S;Raj, B
采用磁巴克豪森噪声（MBN）测量方法，对2.25 Cr-1 Mo钢和9 Cr-1 Mo钢焊接热影响区（HAZ）的粗晶区、细晶区、亚温区（由残余奥氏体和回火铁素体组成）等不同组织区域进行了模拟。据观察，MBN水平随对应于不同显微组织的硬度的增加而降低。对2.25Cr-1 Mo钢和9 Cr-1 Mo钢的实际焊接件的测量证实了这一行为。已经观察到，可以从MBN的峰位置区分临界区和基底金属区，这将有助于非破坏性地测量HAZ的范围。这项研究还表明，使用微型MBN探针与事先校准测量不同的微观结构区域的程度的可能性。(C)1997年Elsevier Science S.A.
Magnetic Barkhausen Noise (MBN) measurements have been used to characterise different microstructural regions such as coarse grain region, fine grain region, intercritical structure (composed of retained austenite and tempered ferrite) within the heat affected zone (HAZ) of 2.25Cr-1Mo steel and 9Cr-1Mo steel weldments using simulated HAZ microstructure samples. It is observed that MBN level decreases with increase in hardness corresponding to different microstructures. This behaviour has been confirmed by the measurements on the actual weldments of 2.25Cr-1Mo steel and 9Cr-1Mo steels. It has been observed that the intercritical region and the base metal region can be distinguished from the peak position of MBN which would be useful for measuring the extent of HAZ non-destructively. This study also shows the possibility of measuring the extent of different microstructural regions using miniature MBN probes with prior calibration. (C) 1997 Elsevier Science S.A.