Correlating pipe dimensions and success of local heat treatment: Developing nomograms to deduce heat treatment parameters

L Prakash, KR Balasubramanian, G Sankar, D Santhosh kumar, V Sudharsanam
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Abstract

Local post-weld heat treatment (PWHT) is the only option for heat treating field welded joints. Quite often, the success of local PWHT in alleviating the residual stress and tempering the material within the soak band (SB) is dependent on the ability to achieve the required heat treatment temperature and maintain through-thickness temperature gradient (TTG) within the specified limits at the end of heating cycle, whence soaking begins. Field observations reveal the inadequacy of AWS D 10.10 specified parameters viz. rate of heating (ROH), heat band (HB) and insulation band width in not achieving the required TTG for certain pipe dimensions. Although prior works have attempted to address this issue by widening the HB, the capacity of the heating equipment often pose a limitation. In such cases, reducing ROH is a plausible alternative. With, no such prior studies seen in literature, an exhaustive finite-element analysis simulating the local PWHT on 81, SA106GrC pipe samples (diameter and thickness varied in 9 levels each) was performed, thrice. First as per AWS recommendations, second by halving the code deduced ROH and third by doubling the code deduced HB. The trend of important outcomes (TTG, power source rating and energy consumption) with great significance to the heat treatment industry were also compared and analysed. Two nomograms were developed to serve as a ready reckoner for field heat treater in not only assessing the adequacy of heat treatment parameters but also with possible alternatives in achieving the desired TTG using field-available power source.
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将管道尺寸与局部热处理的成功率联系起来:开发推导热处理参数的名义图
局部焊后热处理(PWHT)是现场焊接接头热处理的唯一选择。通常情况下,局部 PWHT 能否成功减轻残余应力并在浸泡带 (SB) 内对材料进行回火,取决于能否达到所需的热处理温度,以及能否在加热周期结束时将通厚温度梯度 (TTG) 保持在规定范围内,然后开始浸泡。现场观察表明,AWS D 10.10 规定的参数(即加热速率 (ROH)、加热带 (HB) 和隔热带宽度)在某些管材尺寸下无法达到所需的 TTG。尽管之前的工作尝试通过加宽 HB 来解决这一问题,但加热设备的能力往往会造成限制。在这种情况下,降低 ROH 是一种可行的替代方法。由于文献中没有此类研究,我们对 81 个 SA106GrC 管材样本(直径和厚度各为 9 级)进行了三次详尽的有限元分析,模拟局部 PWHT。第一次是按照 AWS 的建议,第二次是将代码推导的 ROH 减半,第三次是将代码推导的 HB 加倍。此外,还比较和分析了对热处理行业具有重要意义的重要结果(TTG、额定功率和能耗)的趋势。开发的两个名义图不仅可作为现场热处理人员评估热处理参数适当性的计算器,还可作为使用现场可用电源实现理想 TTG 的可能替代方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.70
自引率
8.30%
发文量
166
审稿时长
3 months
期刊介绍: The Journal of Materials: Design and Applications covers the usage and design of materials for application in an engineering context. The materials covered include metals, ceramics, and composites, as well as engineering polymers. "The Journal of Materials Design and Applications is dedicated to publishing papers of the highest quality, in a timely fashion, covering a variety of important areas in materials technology. The Journal''s publishers have a wealth of publishing expertise and ensure that authors are given exemplary service. Every attention is given to publishing the papers as quickly as possible. The Journal has an excellent international reputation, with a corresponding international Editorial Board from a large number of different materials areas and disciplines advising the Editor." Professor Bill Banks - University of Strathclyde, UK This journal is a member of the Committee on Publication Ethics (COPE).
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