Creep Behavior at 1273 K (1000 A°C) in Nb-Bearing Austenitic Heat-Resistant Cast Steels Developed for Exhaust Component Applications

被引：23

作者：

Zhang, Yinhui ^{[1
]}

Li, Mei ^{[2
]}

Godlewski, Larry A. ^{[2
]}

Zindel, Jacob W. ^{[2
]}

Feng, Qiang ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[2] Ford Motor Co, Ford Res & Adv Engn Lab, Dearborn, MI 48124 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2016年 / 47A卷 / 07期

关键词：

STAINLESS-STEELS; CRACK-GROWTH; ALLOYING ADDITIONS; HK40; STEEL; CARBIDE; MICROSTRUCTURE; SUPERALLOY; MORPHOLOGY; FRACTURE; PHASE;

D O I：

10.1007/s11661-016-3544-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A series of Nb-bearing austenitic heat-resistant cast steels with variations of N/C ratios were investigated, and the morphological change of Nb(C,N) from faceted blocks, mixed flake-blocks to "Chinese-script" was observed as N/C ratios decreased. The creep behavior of these alloys was studied at 1273 K (1000 A degrees C), and the longest creep life and lowest creep rate occurred in model alloys with script Nb(C,N). Residual delta-ferrites and (Cr,Fe)(23)C-6 were adverse to creep properties. This work indicates that the control of N/C ratio is required for the as-cast microstructural strengthening.

引用

页码：3289 / 3294

页数：6

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