Effect of welding method and heat treatment on the fracture toughness of low alloy steel deposited metal

IF 3.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Communications Pub Date : 2024-09-02 DOI:10.1016/j.mtcomm.2024.110304

Jingping Ma, Rui Cao, Xin Zhou, Fei Yang, Yuting Zhu, Yi Zhang, Kejin Zhang

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Abstract

The fracture toughness of the weld deposited metal plays an important role in the safe service of the reactor pressure vessel (RPV). Shielded melting arc welding (SMAW) and submerged arc welding (SAW) are two common welding methods in the construction of RPV. In this paper, the effects of the welding method and post-weld heat treatment (PWHT) on the index T of low-temperature fracture toughness of deposited metal were studied respectively. Through the characterization and observation of microstructure and cleavage crack initiation, the effect mechanism of the welding method and PWHT on the low-temperature fracture toughness of deposited metal was determined. The results show that the position in which oxide near the hardening phase is easy to become the cleavage crack initiation of deposited metal. The PWHT dissolves the M-A island to improve the fracture toughness of the deposited metal. The SMAW deposited metal has a smaller oxide inclusion diameter and less cementite than SAW, resulting in higher fracture toughness.

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焊接方法和热处理对低合金钢熔敷金属断裂韧性的影响

焊缝熔敷金属的断裂韧性对反应堆压力容器（RPV）的安全使用起着重要作用。保护熔化弧焊（SMAW）和埋弧焊（SAW）是建造反应堆压力容器的两种常用焊接方法。本文分别研究了焊接方法和焊后热处理（PWHT）对熔敷金属低温断裂韧性指数 T 的影响。通过对微观结构和劈裂裂纹萌生的表征和观察，确定了焊接方法和 PWHT 对熔敷金属低温断裂韧性的影响机理。结果表明，氧化物靠近硬化相的位置容易成为熔敷金属裂纹的起始点。PWHT 可溶解 M-A 岛，从而提高沉积金属的断裂韧性。与 SAW 相比，SMAW 沉积金属的氧化物夹杂直径更小，雪明碳酸盐更少，因此断裂韧性更高。

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

Materials Today Communications Materials Science-General Materials Science

CiteScore

5.20

自引率

5.30%

发文量

1783

审稿时长

51 days

期刊介绍： Materials Today Communications is a primary research journal covering all areas of materials science. The journal offers the materials community an innovative, efficient and flexible route for the publication of original research which has not found the right home on first submission.