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| THE AGING EMBRITTLEMENT OF Cr-Mn-N AUSTENITIC HEAT-RESISTING STEELS |
| KUO YN-YI |
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Cite this article:
KUO YN-YI. THE AGING EMBRITTLEMENT OF Cr-Mn-N AUSTENITIC HEAT-RESISTING STEELS. Acta Metall Sin, 1965, 8(4): 467-550.
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Abstract The influence of various factors on the aging embrittlement of Cr-Mn-N austenitic heat-resisting steels strengthened with Mo, V and B have been studied. It is shown that there are three factors controlling the aging embrittlement. (1) Loss of ductility is accompanied by fine precipitation of carbide and nitride along the grain boundaries. With increasing C and N content, the ductility of the aged steel is dropped sharply. The time-temperature-iso-impact values curves are in form of double C shape. The noses of the curves may possibly be related to the precipitation of carbide and X phase. (2) Strengthening elements such as Mo and B tend to segregate at grain boundaries. The effect of B in steel is to prevent the formation of the continuous fine precipitation film along grain boundaries, thus the aging embrittlement is minimized. Segregation of Mo along grain boundaries promotes brittlement. (3) After aging at temperature interval between 600—850℃ for a long time, austenite will become less stable due to the precipitation of carbide and nitride as M_(23)C_6 and (Cr, Fe)_2N of the solid solution. Thus the diffusionless transformation such as γ→s→α' or γ→α' can easily occur when shock load is applied, and therefore the aged specimens will show low ductility at temperature of testing.
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Received: 18 April 1965
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