Effect of B Content on Morphology and Properties of BN Phase in Martensite Heat Resistant Steel

doi:10.11901/1005.3093.2016.057

Chinese Journal of Materials Research

2017, Vol. 31

Issue (5): 345-351 DOI: 10.11901/1005.3093.2016.057

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Effect of B Content on Morphology and Properties of BN Phase in Martensite Heat Resistant Steel

Yulin MA, Yue LIU(

), Liping ZHANG, Ling ZHOU, Chunming LIU

School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

Cite this article:

Yulin MA, Yue LIU, Liping ZHANG, Ling ZHOU, Chunming LIU. Effect of B Content on Morphology and Properties of BN Phase in Martensite Heat Resistant Steel. Chinese Journal of Materials Research, 2017, 31(5): 345-351.

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Abstract

In order to study the effect of different B element content on the microstructure and mechanical properties of martensitic steel microstructure prepared B element content was 0.012%, 0.02% and 0.03% of the ingredients, discussed the different elements in the matrix B influence mechanism BN phase morphology. The results showed that: with the increase of B content, size matrix BN phase is gradually increased, 0.03% B BN phase in the sample size to about 5 μm; 0.012% B sample tensile and yield strength of the highest value ; Fracture dimples 0.012% B sample in BN phase is the internal fragmentation of the massive, 0.03% B sample BN phase appears stacked sheets laminated spherical shape, because initially formed hexagonal BN phase nuclei in the form of structural growth , after reaching a critical size in the high B content side to locally grown under preferential growth is improved to increase the content of spherical BN B limits of size.

Key words: metallic materials BN precipitates B content martensite heat resistant steel

Received: 14 January 2016

Fund: Supported by National Natural Science Foundation of China (No.51334004), Liaoning Municipal Science and Technology Project (No.201404001)

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	Yulin MA
	Yue LIU
	Liping ZHANG
	Ling ZHOU
	Chunming LIU

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Table 1 Element composition of samples with different B content (%, mass fraction)

Fig.1 Different content of B on microscopic organization chart,(a) (d) 0.012%; (b) (e) 0.02%; (c) (f) 0.03%

Fig.2 Different B content of XRD analysis diagram

Fig.3 Different content of B of optical microscopic organization chart,(a) 0.012%; (b) 0.02%; (c) 0.03%

Fig.4 The tensile properties of the concentrations of different B data Effect of different B data on tensile strength (R_m), yield strength (R_p0.2), elongation rate (A) and section shrinkage (Z)

Fig.5 The fracture morphology of samples with different B content (a) (d)0.012%; (b) (e) 0.02%; (c) (f) 0.03%

Fig.6 The diagram of 0.012%B specimen fracture toughness in the nest second phase spectrum, (a) SEM, (b) BSE

Fig.7 The morphology and energy spectrum of BN phase in the fracture toughness of the 0.02%B and 0.03%B specimen,(a) 0.02%,(b) 0.03%

Fig.8 Morphology of BN phase in samples with different B content, (a) 0.012%, (b) 0.02%, (c) 0.03% BSE, (d) 0.03%

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