Influence of Co, Cu and W on microstructure of 9%Cr steel weld metals
Influence of Co, Cu and W on microstructure of 9%Cr steel weld metals
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DOI：
10.1179/026708303225009652
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发表时间：
2003-03-01
影响因子：
1.8
通讯作者：
Marshall, AW
中科院分区：
文献类型：
--
作者：
Faulkner, RG;Williams, JA;Marshall, AW
对于高温应用，使用含有Mo、V、Nb、N和W以及进一步可能的Co添加物的9-12%Cr等级的铁素体钢的兴趣日益增加。有一个平行的需要焊缝金属的发展，以配合这些材料。一系列的焊缝金属，9 CrMoV的基础上，但与Cu和Co的添加剂和W取代的Mo，已被检查和δ铁素体的分布和内容的影响确定。结果表明，成分差异对δ铁素体含量有直接影响。对于最后一个焊道或沉积结构以及焊垫的中心，δ铁素体形式和含量是不同的，在焊垫的中心处，结构已经被随后的焊道再加热。一般来说，块状铁素体与熔敷焊道和再加热焊缝金属位置的晶间形式相关联，但这些不是唯一的。提出了一个简化的机制来解释铁素体的分布。最后，所测得的铁素体含量被认为是相对于现有的经验关系，从文献中，基于等效的Cr和Ni水平，估计的铁素体水平。
There is an increasing interest in the use of the 9-12%Cr grades of ferritic steel containing Mo, V, Nb, N and W with further possible Co additions, for high temperature applications. There is a parallel need for weld metal development to match these materials. A series of weld metals, based on 9CrMoV but with Cu and Co additions and W replacement of the Mo, have been examined and the effects on delta ferrite distributions and contents identified. The results show that the compositional differences have a direct effect on the delta ferrite content. The delta ferrite form and content are different for the last weld bead, or the as deposited structure, and the centre of the weld pad, where the structure has been reheated by subsequent weld beads. In general, a blocky form of ferrite is associated with the as deposited weld bead and an intergranular form for the reheated weld metal positions but these are not exclusive. A simplified mechanism is proposed for explaining the ferrite distribution. Finally, the measured ferrite contents are considered with respect to the existing empirical relationships from the literature, based on equivalent Cr and Ni levels, for estimation of the ferrite levels.