Precipitation and hardening in irradiated low alloy steels with a wide range of Ni and Mn compositions

被引：61

作者：

Almirall, N. ^{[1
]}

Wells, P. B. ^{[1
]}

Yamamoto, T. ^{[1
]}

Wilford, K. ^{[2
]}

Williams, T. ^{[2
]}

Riddle, N. ^{[2
]}

Odette, G. R. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA

[2] Rolls Royce PLC, Derby, England

来源：

ACTA MATERIALIA | 2019年 / 179卷

基金：

美国国家科学基金会;

关键词：

Pressure vessel steels; Radiation damage; Atom probe tomography; Nano-scale precipitates; Irradiation embrittlement; G-PHASE; FE-CU; EMBRITTLEMENT; EVOLUTION; DAMAGE; MECHANISMS; SEPARATION; MODELS; IRON; APT;

D O I：

10.1016/j.actamat.2019.08.027

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Mn-Ni-Si intermetallic precipitates (MNSPs) that are observed in some Fe-based alloys following thermal aging and irradiation are of considerable scientific and technical interest. For example, large volume fractions (f) of MNSPs form in reactor pressure vessel low alloy steels irradiated to high fluence, resulting in severe hardening induced embrittlement. Nine compositionally-tailored small heats of low Cu RPV-type steels, with an unusually wide range of dissolved Mn (0.06-1.34 at.%) and Ni (0.19-3.50 at.%) contents, were irradiated at approximate to 290 degrees C to approximate to 1.4 x 10(20) n/cm(2) at an accelerated test reactor flux of approximate to 3.6 x 10(12) n/cm(2)-s (E> 1 MeV). Atom probe tomography shows Mn-Ni interactions play the dominant role in determining the MNSP f, which correlates well with irradiation hardening. The wide range of alloy compositions results in corresponding variations in precipitates chemistries that are reasonably similar to various phases in the Mn-Ni-Si projection of the Fe based quaternary. Notably, f scales with approximate to Ni(1.6)mn(0.8). Thus f is modest even in advanced high 3.5 at.% Ni steels at very low Mn (Mn starvation); in this case Ni-silicide phase type compositions are observed. (C) 2019 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

引用

页码：119 / 128

页数：10

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