EFFECT OF LONG TERM AGING ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF CAST AUSTENITIC STAINLESS STEELS

doi:10.3724/SP.J.1037.2010.00250

Acta Metall Sin

2010, Vol. 46

Issue (10): 1186-1191 DOI: 10.3724/SP.J.1037.2010.00250

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EFFECT OF LONG TERM AGING ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF CAST AUSTENITIC STAINLESS STEELS

LI Shilei, WANG Yanli, LI Shuxiao, WANG Xitao

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

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LI Shilei WANG Yanli LI Shuxiao WANG Xitao. EFFECT OF LONG TERM AGING ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF CAST AUSTENITIC STAINLESS STEELS. Acta Metall Sin, 2010, 46(10): 1186-1191.

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Abstract In order to study the mechanism of mid–temperature thermal aging embrittlement in cast austenite stainless steel (CASS), the mechanical properties and microstructure were investigated of CASS which was aged at 400 ℃for 10⁴ h. The results show that, no change in the ferrite content (volume fraction) was detected. After long term aging, the magnetic permeability of the CASS declined, bt the nano–hardness of ferrite phases increased. The Charpy impact energy decreased rapidly and the impact fracture morphologies changed with aging time. Large number of α' particles precipitated homogeneously in the ferrite phases of the CASS aged for 10⁴ h. α′ precipittion produced by spinodal decomposition in ferrite was considered to the primary mechanism of thermal aging in CASS at mid-temperature. G phases were also observed n some positions of ferrite after long term aging.

Key words: cast austenitic stainless steel thermal aging ferrite content mechanical property

Received: 24 May 2010

ZTFLH:

TG142.71

Fund:

Supported by National Basic Research Program of China (No.2006CB605005) and High Technology Research and Development Program of China (No.2008AA031702)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00250 OR https://www.ams.org.cn/EN/Y2010/V46/I10/1186

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