RELATIONSHIP BETWEEN THE EVOLUTION OF PHASE PARAMETERS OF GRAIN BOUNDARY M23C6 AND EMBRITTLEMENT OF HR3C SUPER-HEATER TUBES IN SERVICE

doi:10.11900/0412.1961.2015.00077

Acta Metall Sin

2015, Vol. 51

Issue (11): 1325-1332 DOI: 10.11900/0412.1961.2015.00077

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RELATIONSHIP BETWEEN THE EVOLUTION OF PHASE PARAMETERS OF GRAIN BOUNDARY M₂₃C₆ AND EMBRITTLEMENT OF HR3C SUPER-HEATER TUBES IN SERVICE

Zhifang PENG¹(

),Wen REN¹,Chao YANG²,Fangyu CHEN³,Hongguo LIU⁴,Fangfang PENG⁵,Qingsong MEI¹

1 School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072
2 Jiangsu Frontier Electric Technology Co. Ltd., Nanjing 211102
3 Research Institute of Wuhan Iron and Steel (Group) Corp., Wuhan 430080
4 Shenhua (Fujian) Energy Co. Ltd., Fuzhou 350004
5 Dongfang Boiler Group Co. Ltd., Zigong 643000

Cite this article:

Zhifang PENG,Wen REN,Chao YANG,Fangyu CHEN,Hongguo LIU,Fangfang PENG,Qingsong MEI. RELATIONSHIP BETWEEN THE EVOLUTION OF PHASE PARAMETERS OF GRAIN BOUNDARY M₂₃C₆ AND EMBRITTLEMENT OF HR3C SUPER-HEATER TUBES IN SERVICE. Acta Metall Sin, 2015, 51(11): 1325-1332.

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Abstract

The relationship of the evolution of the phase parameters (area fraction ? M 23 C 6 and equivalent width W ) of grain boundary M₂₃C₆ plates with the embrittlement of HR3C super-heater tube samples in service was studied. Based on the ASTM E112 standard charts, the total length of two dimensional austenite grain boundaries (L_gb) corresponding to each grain size number (G_L) was determined in the observed area of the metallographic images and expressed as L_gb (G_L). Making use of the SEM-SE images of the samples, the ? M 23 C 6 and W were determined. The relationships of W with G_Land ? M 23 C 6 were established as W(G_L, ? M 23 C 6 ). Combined with the result from a Charpy impact test, the function of the impact value (a_KV) as the W was obtained. In addition, the grain boundary elastic modulus (E_r) was measured by a nano-hardness test. The result shows that intergranular fracture occurred on all the room temperature impact test specimens taken from the super-heater tubes exposed under the operating conditions. The W was increased with the decrease of G_L and the increase of E_r at a constant ? M 23 C 6 , causing a corresponding decrease of a_KV, and hence promoting the embrittlement of the HR3C super-heater tubes. The related mechanism for the intergranular fracture caused by the increase of the equivalent width W of grain boundary carbides (carbide coarsening) can be explained through the application of the proposed method.

Key words: HR3C steel embrittlement M₂₃C₆ equivalent width Charpy impact value

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	Zhifang PENG
	Wen REN
	Chao YANG
	Fangyu CHEN
	Hongguo LIU
	Fangfang PENG
	Qingsong MEI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00077 OR https://www.ams.org.cn/EN/Y2015/V51/I11/1325

Table 1 Service conditions and dimensions of HR3C super-heater tubes

Table 2 Chemical compositions of HR3C super-heater tube samples

Fig.1 SEM-SE images of impact fractography of HR3C super-heater tube samples

(a) SH1.6 (b) SH3.2 (c) SH4.0 (d) SH5.6

Fig.2 OM images of HR3C super-heater tube samples

Fig.3 SEM-SE images of HR3C super-heater tube samples

Fig.4 Relationships of the total length of grain boundaries (L_gb) with the austenite grain size number (G_L) in the observed areas (100 times under 5000 mm² observation area)

Fig.5 Comparison between mean values of grain size numbers G_M (ASTM E112) and G_L (this work) of HR3C super-heater tube samples

Fig.6 Variation of the equivalent width of grain boundary M₂₃C₆ plates (W) with their area fraction (? M 23 C 6 ) and the grain size number (G_L)

Fig.7 Charpy impact value (a_KV) and the equivalent width (W) of grain boundary M₂₃C₆ plates of HR3C tube samples (a) and a_KV vs W (b)

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