Effects of Cr and Nb addition on high-temperature tensile properties in austenitic cast steels used for turbo-charger application

被引：12

作者：

Jung, Seungmun ^{[1
]}

Sohn, Seok Su ^{[1
]}

Jo, Yong Hee ^{[1
]}

Choi, Won-Mi ^{[1
]}

Lee, Yeong-Joo ^{[1
]}

Oh, Yong-Jun ^{[2
]}

Kim, Gi-Yong ^{[3
]}

Jang, Seongsik ^{[3
]}

Lee, Sunghak ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol, Ctr Adv Aerosp Mat, Pohang 790784, South Korea

[2] Hanbat Natl Univ, Dept Adv Mat Engn, Daejeon 305719, South Korea

[3] Res & Dev Ctr Key Yang Precis, Gimcheon 740180, South Korea

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 677卷

关键词：

Austenitic cast steel; Turbo-charger; Replacement of W by Nb or Cr; MC and M7C3 carbides; STAINLESS-STEELS; MECHANICAL-PROPERTIES; OXIDATION RESISTANCE; NIOBIUM ADDITIONS; CREEP-RESISTANT; WEAR PROPERTIES; HIGH-STRENGTH; PRECIPITATION; MICROSTRUCTURE; FATIGUE;

D O I：

10.1016/j.msea.2016.09.049

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In automotive turbo-chargers, excellent high-temperature properties are needed for retaining their structures at extremely high temperature of exhausted gas, and thus austenitic cast steels have been actively developed. In this study, high-temperature tensile properties of austenitic cast steels containing different W, Nb, and Cr were interpreted by deformation and fracture mechanisms related with carbides and austenite matrix. Replacement effects of W by Nb or Cr were also investigated because of expensive alloying cost of W. The high-temperature tensile test results revealed that the Cr-added steel containing many M7C3 carbides showed the higher strength than the Nb-added steel containing hard MC carbides. This was because the strength could be enhanced by distributing carbides having slightly lower hardness such as M7C3 carbides in the strengthened matrix as it could hold hard carbides, like in the Cr-added steel. The Cr-added steel (1 wt% W) also showed the higher strength and elongation at 900 degrees C than the basic-composition steel (2 wt% W), which indicated that the partly replacement of W by Cr was successfully achieved. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：316 / 324

页数：9

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