Search for high-creep-strength welding conditions considering HAZ shape factors for 2 1/4Cr–1Mo steel

IF 2.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Welding in the World Pub Date : 2024-03-16 DOI:10.1007/s40194-024-01727-3

Hitoshi Izuno, Masahiko Demura, Masayoshi Yamazaki, Satoshi Minamoto, Junya Sakurai, Kenji Nagata, Yoh-ichi Mototake, Daisuke Abe, Keisuke Torigata

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Abstract

The creep rupture life of ferritic heat-resistant steel weld joints is limited by Type IV cracking that occurs in the heat-affected zone (HAZ), whose shape affects creep damage accumulation. In this study, we address the inverse problem of extending the creep rupture life of weld joints by controlling HAZ shape via welding conditions. As reported separately, we have developed a workflow that predicts weld joint creep rupture life from the predicted HAZ shape from welding conditions and have implemented it in the material design system. Using this workflow, we presented a tandem Bayesian model for predicting the creep rupture life from welding conditions via the geometric features of HAZ shapes (HAZ shape factors), which are considered to determine the creep rupture life. The prediction model of a HAZ shape factor from welding conditions was formed by Gaussian process regression. The prediction model of the creep rupture life was formed by Bayesian linear regression. These models were probabilistically connected by Bayesian statistical mathematics. An algorithm to increase the creep rupture life was developed to search for welding conditions. This method was applied to a 2 1/4Cr–1Mo heat-resistant steel weld joint simulated with a plate I-bevel three-layer gas tungsten arc welding. The number of welding conditions combination reaches \({7}^{8}=5764801\). Start from 49 initial HAZ shape factors and 22 creep rupture life data, we performed forward calculations of 20 rupture lives to find welding conditions that can improve the creep rupture life by 12% over the initial data.

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考虑 2 1/4Cr-1Mo 钢的热影响区形状因素，寻找高陡强度焊接条件

摘要铁素体耐热钢焊接接头的蠕变断裂寿命受到发生在热影响区（HAZ）的 IV 型裂纹的限制，而热影响区的形状会影响蠕变损伤的累积。在本研究中，我们解决了通过焊接条件控制热影响区形状来延长焊点蠕变断裂寿命的逆问题。正如单独报告的那样，我们开发了一个工作流程，根据焊接条件预测的热影响区形状来预测焊点蠕变断裂寿命，并将其应用到材料设计系统中。利用该工作流程，我们提出了一个串联贝叶斯模型，通过 HAZ 形状的几何特征（HAZ 形状因子）预测焊接条件下的蠕变断裂寿命，HAZ 形状因子被认为是决定蠕变断裂寿命的因素。通过高斯过程回归建立了从焊接条件预测 HAZ 形状因子的模型。蠕变断裂寿命的预测模型是通过贝叶斯线性回归建立的。这些模型通过贝叶斯统计数学进行概率连接。开发了一种提高蠕变断裂寿命的算法来寻找焊接条件。将该方法应用于 2 1/4Cr-1Mo 耐热钢焊点，模拟了板式 I 型坡口三层气体钨极氩弧焊。焊接条件组合的数量达到了（{7}^{8}=5764801\）。从 49 个初始 HAZ 形状因子和 22 个蠕变断裂寿命数据出发，我们对 20 个断裂寿命进行了正向计算，找到了能将蠕变断裂寿命比初始数据提高 12% 的焊接条件。

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

Welding in the World METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

4.20

自引率

14.30%

发文量

181

审稿时长

6-12 weeks

期刊介绍： The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.