EFFECTS OF B AND P ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF GH984 ALLOY

doi:10.3724/SP.J.1037.2013.00002

Acta Metall Sin

2013, Vol. 29

Issue (4): 421-427 DOI: 10.3724/SP.J.1037.2013.00002

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EFFECTS OF B AND P ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF GH984 ALLOY

XIAO Xuan¹⁾, ZHAO Haiqiang^1,²⁾, WANG Changshuai²⁾, GUO Yongan²⁾, GUO Jianting²⁾,ZHOU Lanzhang²⁾

1) School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110168
2) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

XIAO Xuan, ZHAO Haiqiang, WANG Changshuai, GUO Yongan, GUO Jianting,ZHOU Lanzhang. EFFECTS OF B AND P ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF GH984 ALLOY. Acta Metall Sin, 2013, 29(4): 421-427.

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Abstract

The Ni-Fe based superalloy GH984 with microalloying is fabricated by vacuum induction furnace and hot worked by hot forging and rolling. The effect of B and P microalloying on microstructure and mechanical properties of GH984 alloy was investigated by OM, SEM and TEM after standard heat treatment. The experiment results showed that the addition of B and P has no obvious effects on the microstructure of GH984 alloy which has precipitates of sphericalγ', Ti(C, N), blocky MC as well as discrete M₂₃C₆ distributing along grain boundary. Moreover, the addition of B and P has no obvious influence on the tensile strength at room temperature and 700℃. However, tensile ductility increases greatly at 700 ℃ after B and P doping. It is worth to note that B and P microslloying can improve the stress rupture life of the alloy significantly. For example, the rupture life at the condition of 700 ℃ and 350 MPa increases from initial 115.03 h to 984.15 h. Investigation on the microstucture of the creep samples exhibites that B and P could effectively improve the strength of grain boundary and the fractural model from intergranular fracture to intergranular/transgranular mixed fracture.

Key words: GH984 heat-resistant superalloy B and P microalloy microstructure tensile property creep strength

Received: 04 January 2013

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	XIAO Xuan
	ZHAO Haiqiang
	WANG Changshuai
	GUO Yongan
	GUO Jianting
	ZHOU Lanzhang

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00002 OR https://www.ams.org.cn/EN/Y2013/V29/I4/421

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