Effective design of new austenitic cast steels for ultra-high temperature automotive exhaust components through combined CALPHAD and experimental approaches

Y.H. Zhang; M. Li; L.A. Godlewski; J.W. Zindel; Q. Feng

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Effective design of new austenitic cast steels for ultra-high temperature automotive exhaust components through combined CALPHAD and experimental approaches

机译：通过结合CALPHAD和实验方法，有效设计用于超高温汽车排气部件的新型奥氏体铸钢

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Designing engines with higher power densities to comply with ever increasing emissions and fuel economy regulations requires the development of cost-effective alloys with superior properties than existing high-performance alloys. A new class of Nb-bearing austenitic heat-resistant cast steels showed promise to withstand exhaust gas temperatures of as high as 1000 ℃. This paper describes the development of this new class of alloys using combined CALPHAD (CALculation of PHAse Diagrams) and experimental approaches to investigate the effect of C and N additions on the microstructure and tensile properties. Composition ranges were first established based on CALPHAD predictions to achieve the desired phases, and then four alloys of varying N/C ratios were cast and experimentally characterized to determine quantitatively the microstructure and mechanical properties. Microstructural characterization revealed that the NbC/Nb(C,N) phase transformed from "Chinese-script", a mixed flake-blocky morphology to faceted-blocky morphology as the N/C ratio increased. The area fractions of the different phases were quantified and agreed favorably with the calculated results. Alloys with the "Chinese-script" NbC/Nb(C,N) showed favorable tensile properties at room temperature and 1000 "C. Excessive 8-ferrite diminished the tensile resistance at 1000 ℃, while limited quantity of (Cr, Fe)_(23)C_6 did not show adverse effects.

机译：设计具有更高功率密度的发动机，以符合不断增长的排放和燃油经济性法规，这要求开发具有比现有高性能合金更高性能的具有成本效益的合金。新型的含铌奥氏体耐热铸钢显示出有望承受高达1000℃的废气温度。本文介绍了使用结合的CALPHAD（计算PHAse图）和开发研究C和N添加对显微组织和拉伸性能的影响的实验方法开发的新型合金。首先根据CALPHAD预测确定成分范围，以实现所需的相，然后铸造N / C比率不同的四种合金，并进行实验表征以定量确定微观结构和力学性能。显微组织表征表明，随着N / C比的增加，NbC / Nb（C，N）相从混合的片状-块状形态转变为“片状-块状”形态。量化不同相的面积分数，并与计算结果一致。带有“中文” NbC / Nb（C，N）的合金在室温和1000“ C时表现出良好的拉伸性能。过多的8-铁氧体会降低1000℃的拉伸强度，而有限量的（Cr，Fe）_ （23）C_6没有显示出不良反应。

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来源
《Materials Science and Engineering》 |2017年第23期|195-206|共12页
作者
Y.H. Zhang; M. Li; L.A. Godlewski; J.W. Zindel; Q. Feng;
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作者单位

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

Ford Research and Advanced Engineering Laboratory, Ford Motor Company, Dearborn, MI 48124, USA;

Ford Research and Advanced Engineering Laboratory, Ford Motor Company, Dearborn, MI 48124, USA;

Ford Research and Advanced Engineering Laboratory, Ford Motor Company, Dearborn, MI 48124, USA;

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China,Beijing Key Laboratory of Special Melting and Reparation of High-end Metal Materials, University of Science and Technology Beijing, Beijing 100083, China;

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正文语种 eng
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关键词
Austenitic cast steel; CALPHAD; Carbonitride; Ferrite; Tensile property;

机译：奥氏体铸钢;卡尔帕德;碳氮化物;铁氧体拉伸性能;

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机译：奥氏体铸铁Ni-Resist D5S和HK30奥氏体铸钢在800℃氩气和合成柴油排气中的腐蚀疲劳
3. Effects of N/C Ratio on Solidification Behaviors of Novel Nb-Bearing Austenitic Heat-Resistant Cast Steels for Exhaust Components of Gasoline Engines [J] . Zhang Yinhui, Li Mei, Godlewski Larry A., Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science . 2017,第3期

机译：N / C比对汽油发动机排气部件新型NB耐奥氏体耐热铸钢凝固行为的影响
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Effective design of new austenitic cast steels for ultra-high temperature automotive exhaust components through combined CALPHAD and experimental approaches

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