The Paton Welding Journal, 2012, №07



2012 №07 (05)

2012 №07 (07)

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The Paton Welding Journal, 2012, #7, 23-27 pages  

EFFECT OF HEAT TREATMENT ON SENSITIVITY OF THE HAZ METAL ON TITANIUM-STABILISED AUSTENITIC STEEL TO LOCAL FRACTURE

Yu.V. POLETAEV

Volgodonsk Institute (Branch) of South Russian State Technical University
(Novocherkassk Polytechnic Institute), Volgodonsk, Russia
 
 
Abstract
The mechanism of embrittlement of the HAZ metal of welded joints on steel 12Kh18N12T was revealed. This mechanism was found to be associated with development of the processes of direct and relative softening of grain boundaries in welding and at high-temperature low-frequency low-cycle loading. The efficiency of austenising to improve local fracture resistance of the welded joint HAZ metal was experimentally proved.
 
 
Keywords: arc welding, welded joint, austenitic steel 12Kh18N12T, heat-affected zone, structural and chemical microheterogeneity, evaluation of weldability, optical and electron microscopy, heat treatment - austenising, low-frequency low-cycle loading, local fracture
 
 
Received:                29.11.11
Published:               28.07.12
 
 
References
1. Zemzin, V.N., Shron, R.Z. (1978) Heat treatment and properties of welded joints. Leningrad: Mashinostroenie.
2. Zemzin, V.N., Zhitnikov, N.P. (1972) Conditions of cracking in near-weld zone of joints during heat treatment. Avtomatich. Svarka, 2, 1-5.
3. Yarkovoj, V.S., Muromtsev, B.I., Komissarov, V.G. (1969) Long-term strength of parent metal and welded joints of steels 08Kh18N9 and 07Kh16N9M2. Ibid., 6, 38-40.
4. Khromchenko, F.A. (1982) Reliability of welded joints on boiler pipes and steam pipelines. Moscow: Energoizdat.
5. Tarnovsky, A.I., Poletaev, Yu.V., Feklistov, S.I. (1983) Applications of A-q dependencies for evaluation of susceptibility of austenitic class steels and alloys to formation of hot near-weld cracks in welding. In: Novel in welding technology of nuclear power plant equipment: Trudy TsNIITMash, 179, 82-84.
6. Kulikov, I.S. (1988) Thermodynamics of carbides and nitrides: Refer. Book. Chelyabinsk: Metallurgiya.
7. Livshits, L.S. (1979) Metals science for welders (welding of steels). Moscow: Mashinostroenie.
8. Poletaev, Yu.V. (2010) Long-term low-cycle strength of welded joints and choice of austenite-stable steels. Novocherkassk: LIK.
9. Lozinsky, M.G., Romanov, A.N., Malov, V.V. (1977) Study of austenitic steel structure at different forms of elastic-plastic high-temperature deformation cycles. In: Structural factors of low-cycle fracture of metals. Moscow: Nauka.
10. Lyuttsau, V.G. (1977) Current concepts of a structural mechanism of deformation ageing and its role in fracture propagation at low-cycle fatigue. Ibid., 5-21.
11. Mints, I.I., Berezina, T.G. (1972) Stability of dislocation structure of cold-worked steels Kh18N12T and Kh16N9M2 in conditions of high-temperature ageing. Fizika Metallov i Metallovedenie, 34(3), 615-620.

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Suggested Citation

Yu.V. POLETAEV (2012) EFFECT OF HEAT TREATMENT ON SENSITIVITY OF THE HAZ METAL ON TITANIUM-STABILISED AUSTENITIC STEEL TO LOCAL FRACTURE. The Paton Welding J., 07, 23-27.

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