Segregation behavior of phosphorus in the heat-affected zone of an A533B/A182 dissimilar weld joint before and after simulated thermal aging

被引：13

作者：

Zhai, Ziqing ^{[1
]}

Miyahara, Yuichi ^{[2
]}

Abe, Hiroshi ^{[1
]}

Watanabe, Yutaka ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Aoba Ku, Sendai, Miyagi 9808579, Japan

[2] Cent Res Inst Elect Power Ind, Mat Sci Res Lab, Yokosuka, Kanagawa 2400196, Japan

来源：

JOURNAL OF NUCLEAR MATERIALS | 2014年 / 452卷 / 1-3期

关键词：

GRAIN-BOUNDARY SEGREGATION; PRESSURE-VESSEL STEELS; ATOM-PROBE TOMOGRAPHY; MO BAINITIC STEELS; LOW-ALLOY STEEL; CLEAVAGE FRACTURE; INTERGRANULAR EMBRITTLEMENT; TEMPER EMBRITTLEMENT; MICROSTRUCTURE; STRENGTH;

D O I：

10.1016/j.jnucmat.2014.05.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The segregation behavior of phosphorus (P) in the heat-affected zone (HAZ) of an A533B/A182 dissimilar weld joint before and after step cooling was investigated with atom probe tomography. At grain/packet boundaries, the final P segregation level consisted of non-equilibrium segregation that occurred during cooling after welding and post-weld heat treatment (PWHT) and equilibrium segregation that occurred during step cooling. In both processes, higher P coverage was observed in the coarse-grained and intercritically reheated coarse-grained HAZ than in the fine-grained HAZ and base material. The cooling after welding and PWHT seemed to have a pronounced impact on P segregation in the subsequent aging process. In addition, P segregation also occurred at the precipitate/matrix interfaces of cementite, Mo2C and Al-Si rich precipitates. The evolution of P coverage at these two types of sites suggested increasing risks of embrittlement with an increase in aging time. (C) 2014 Elsevier B. V. All rights reserved.

引用

页码：133 / 140

页数：8

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