EFFECT OF AUSTENITIZING TEMPERATURE ON STRUCTURE AND  MECHANICAL PROPERTIES OF 23NiCo ALLOY

Acta Metallurgica Sinica (English Letters) ›› 1999, Vol. 12 ›› Issue (4): 621-625.

• Research paper • Previous Articles Next Articles

EFFECT OF AUSTENITIZING TEMPERATURE ON STRUCTURE AND MECHANICAL PROPERTIES OF 23NiCo ALLOY

P. Zhong, B. Ling and B. Z. Gu Beijing Institute of Aeronautical Materials,Beijing 100095 ,China

Received:1999-08-25 Revised:1999-08-25 Online:1999-08-25 Published:2009-10-10

Abstract

Abstract: Effectof the austenitizing temperature on the microstructure, strength, and toughness of23 NiCo alloy wasstudied . With increasing theaustenitizingtemperature,the reductionsin strength and hardness are probably caused by the coarsening of M2 Ccarbides. The use of higheraustenitizingtemperatureresultedinimproved impacttoughness duetothe dissolutionof undissolved,( CrFeMo)23 C6 carbides. For austenitizingtemperaturesgreaterthan 950 ℃ resultedinthelossofimpacttoughness. Astheaustenitizingtemperatureisincreasedto1050 ℃impacttoughnesslevelsarereduced on an averageby53 J/cm2 .Examination ofthefrac turesurfaceofimpacttoughnessspecimens viascanningelectron microscopy ( SEM) revealedthataustenitizing at1050 ℃and aged at482℃wasintergranularfracture .It wassuggested thatthisgrain boundary embrittlement wastheresultofthe formation of cementite particlesduring aging.

Key words: secondary hardening, 23 NiCo alloy, austenitizingtemperature

P. Zhong, B. Ling and B. Z. Gu Beijing Institute of Aeronautical Materials,Beijing 100095 ,China. EFFECT OF AUSTENITIZING TEMPERATURE ON STRUCTURE AND MECHANICAL PROPERTIES OF 23NiCo ALLOY[J]. Acta Metallurgica Sinica (English Letters), 1999, 12(4): 621-625.

[1]	Ci DING, Weixin HAN. Secondary hardening behavior of 15CrMnMoV thin rolled tube [J]. Acta Metallurgica Sinica (English Letters), 2010, 23(4): 261-266.
[2]	B. Ling; P. Zhong;B. W Zhong; Z. Y Zhao and S.Q. Zhang(Beijing Institute of Aeronautical Materials, Beijing 100095,China Manuscript received 26 August 1996). ON THE STRENGTHENING MECHANISM OF HIGH Co-Ni ULTRAHIGH STRENGTH STEEL [J]. Acta Metallurgica Sinica (English Letters), 1996, 9(6): 647-651.
[3]	YU Xuejie Shanghai Iron and Steel Research Institute,Shanghai,China ZHOU Tianjian Anhui Institute of Technology,Hefei,China YU Xuejie Senior Engineer,Shanghai Iron and Steel Research Institute,1001 Taihe Road,Wusong,Shanghai 200940,China. SECONDARY HARDENING OF BAINITE IN HIGH SPEED STEEL [J]. Acta Metallurgica Sinica (English Letters), 1990, 3(2): 99-103.

EFFECT OF AUSTENITIZING TEMPERATURE ON STRUCTURE AND MECHANICAL PROPERTIES OF 23NiCo ALLOY

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