Evolution of Ti-Based Nonmetallic Inclusions During Solution Treatment of Maraging 250 Steel: Thermodynamic Calculations and Experimental Verification

Shmulevitsh, Mati; Pinkas, Malki; Weizman, Amir; Frage, N.

doi:10.1007/s11663-011-9486-5

Cited by 3 publications

(1 citation statement)

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“…The Ti(C x ,N 1-x ) inclusion was formed as a result of reactions of Ti with nitrogen and carbon, which originated from raw materials or from a furnace environment and their formation cannot be avoided completely. Shmulevitsh et al investigated the stability of Ti(C x N 1-x ) inclusion at equilibrium with austenite in maraging 250 steel, and found that the concentration of Ti(C x N 1-x ) in austenite decreased monotonically from 11.25 Â 10 À4 mole to 6.25 Â 10 À4 mole as the temperature increased from 900 C to 1300 C. 14 A comparison of inclusions in the parent material zone and fusion zone in as-weld condition on optical microscope, as shown in Figure 7, reveals that despite the melting and solidification periods being quite short in welding process, inclusions in fusion zone are remarkably reduced in the density and size in relation to parent material zone. The electron probe XÀray microanalyzer (EPMA) spectrum for the inclusion revealed high contents of C, N, Al and Ti as shown in Figure 8, whose composition is given in Table 2.…”

Section: Microstructure and Hardness In Post-weld Aged Conditionsmentioning

confidence: 99%

Microstructure and mechanical properties of stainless maraging steel laser weldments after ageing at different temperatures

Meng

Liu

Gao

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part L:

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The microstructure and mechanical properties of Fe-Cr-Ni-Mo-Ti stainless maraging steel laser weldments have been investigated after post-weld ageing treatments in a temperature range from 420 C to 580 C. Metallographic characterization of laser weldment revealed three zones, i.e. fusion zone, heat-affected zone and unaffected parent material zone. Martensite was the predominant phase in the three zones when the ageing temperature was lower than 500 C whereas a large amount of reverted austenite occurred in three zones on ageing above 500 C, leading to hardness decrease accordingly. Hardness distribution across the welds demonstrated that after all ageing treatments, the hardness in heat-affected zone was greatly increased to above 420 HV from 320 HV in as-weld condition, and hardness in three regions varied with different trends with increasing ageing temperature. The different ageing behavior in fusion zone and parent material zone has been discussed by comparison of dissolution of Ti(C, N) x inclusion within them during welding thermal cycle. The tensile properties were found satisfactory in weld subjected to ageing at 460 C; the yield strength was increased by 14.5% as compared with as-received aged parent material. A graph was established for determination of fracture location and post-weld ageing efficiency using measured hardness values in both heat-affected zone and parent material zone.

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Section: Microstructure and Hardness In Post-weld Aged Conditionsmentioning

confidence: 99%