A Study on Microstructure of Ductile Ni-Resist Cast Iron for Exhaust Manifolds and Mechanical Property at the Condition of Altermative Thermal Cycles

Abstract:

The kind of ductile Ni-resist cast iron which will be used to exploit the exhaust manifold in First Automotive Works mainly contains up to 29 wt% Nickel, 4.9 wt% silicon and 1.7 wt% chromium. The main part of this study focused on the microstructure characterization of the as-cast condition and mechanical property at the condition of alternative thermal cycles. In the cast state, the alloy consists of the austentic matrix and carbides. The carbides contain M₆C and M₇C₃. And FeNi₃ phase is found in the austentic matrix. After alternative thermal cycles at 900 , the hardness value gradually descends from 203 HV to 170 HV.

• Periodical: Advanced Materials Research (Volumes 194-196)
• Pages: 95-99
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.194-196.95
• Online since: February 2011
• Authors: Yun Long Yang, Zhan Yi Cao, Zhen Song Lian, Hai Xia Yu
• Keywords: Ductile Ni-Resist Cast Iron, Exhaust Manifold, Heat-Resistant Cast Iron, Microstructure

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