The morphology and ageing behaviour of δ-ferrite in a modified 9Cr-1Mo steel
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Cited by (13)
Prediction and analysis of magnetically impelled arc butt welded dissimilar metal
2019, Materials Today: ProceedingsCitation Excerpt :Additionally, in the nuclear reactor systems the above mentioned steels have considered as the alternate for the austenitic steel, due to its high amount of resistance against the embrittling due to irradiation and ducting. Currently some alloy steels are altered for the applications such as modified 9% Chromium – 1% Molybdenum steel (T91) [7]. In concern with improving the working properties tempered and normalized T91 have been utilized in the thermal power plant [8].
Creep rupture behavior of welded Grade 91 steel
2016, Materials Science and Engineering: AA roadmap for tailoring the strength and ductility of ferritic/martensitic T91 steel via thermo-mechanical treatment
2016, Acta MaterialiaCitation Excerpt :TMT of T91 steels further enhances their mechanical strength with moderate loss of tensile ductility as shown in Fig. 15b. In the current study, δ-ferrite was absent in the selected austenization range of 800–1200 °C in T91 steel, consistent with earlier studies that show δ-ferrite formed during normalization above 1250 °C for 5 min or longer [46,47]. δ-ferrite is detrimental to the creep strength of T91 [48].
Microstructural evolution of delta ferrite in SAVE12 steel under heat treatment and short-term creep
2012, Materials CharacterizationCitation Excerpt :Therefore, delta ferrite can be formed during solidification process, hot working, and welding process. The presence of delta ferrite in steels reduces the attainable strength, fatigue endurance limit and impact resistance [8–11]. For austenitic stainless steels [12–14] and martensitic stainless steels [15,16], plenty of investigations about delta ferrite have been carried out.
Influence of microstructural inhomogeneities on the fracture toughness of modified 9Cr-1Mo steel at 298-823 K
2012, Journal of Nuclear MaterialsCitation Excerpt :Austenitising temperature and cooling rate are known to influence the microstructure of this class of steels [19,21]. Water quenching from a high austenitising temperature (>1573 K) results in presence of delta ferrite in the microstructure [20,21]. At lower [20] austenitising temperature (1323 K) furnace cooling results in formation of proeutectoid-ferrite regions within the martensite.
A study on martensitic phase transformation in 9Cr-1W-0.23V-0.063Ta-0.56Mn- 0.09C-0.02N (wt.%) reduced activation steel using differential scanning calorimetry
2010, Journal of Nuclear MaterialsCitation Excerpt :The formation of hard and brittle martensite as a result of the solutionising and quenching heat treatment and its subsequent tempering to achieve the desired balance between toughness and strength constitute the core physical metallurgy of modern power plant steels [1–10]. Not surprisingly therefore, numerous studies, both on experimental [11–48] and modelling – simulation fronts [49–84] have been conducted till date to understand the phase and microstructural stability of these alloys upon high temperature service-exposure and the attending changes in physical and mechanical properties in terms of simple intuitively understood metallurgical concepts. Thanks to the immense and coordinated worldwide research, the present day high chromium power plant steels have scientifically tailored chemical compositions, melting practices and thermomechanical processing schedules that make possible the attainment of fairly stable microstructure with desired physical and mechanical properties [1,2].