Erosion Behavior of CA-15 Tempered Martensitic Stainless Steel

2006

Mater. Trans.

Self Cite

The effects of hot rolling and subsequent tempering on particle erosion behavior of SUS403 MSS were investigated as a function of impact angle, reduction and grain size. The results indicated that, cutting is the dominant wear mode for material removal at oblique impact angle. At the higher impact angle, the mode is based on extrusion and cracking. However, at the medium impact angle, the wear is dominated by mode mixed with cutting and extrusion. The characteristics of the cracking are more obvious with increasing impact angle. The erosion rates of all reduction samples increase first and then decrease with increasing impact angle. The maximum erosion rate occurs at the angle of 45. After hot rolling, grain refining has an effect on decreasing erosion rates in comparison to the direct quenched and tempered samples. Fine grain associated with high density of grain boundary and with strengthening effect in mechanical properties retards the cracking and then decreases the erosion rate. The effect of grain refining on decreasing erosion rate is more obvious with increasing both the impact angle and the reduction. At the normal impact angle, the percentage of decrement of erosion rate is approximately 45% when the material was rolled with 50% reduction. Increasing in the mechanical properties including hardness, ductility, tensile strength and toughness are contributed to decreasing the erosion rate.

Section: Correlation Between Erosion Rate Grain Size and Mechanical contrasting

confidence: 99%

Effects of Hot Rolling and Subsequent Tempering on Particle Erosion Behavior of SUS403 Martensitic Stainless Steel

2006

Mater. Trans.

Self Cite

“…Hence, the maximum erosion rate appears at an impinging angle of approximately 30°. The ductile erosion behavior of the tested material is similar to the results reported by Teng et al regarding the erosion behavior of CA-15 tempered martensitic stainless steel [22]. Figure 5 shows that for a given impinging angle, the erosion rate decreases as the reduction ratio increases.…”

Section: Microstructuresupporting

confidence: 84%

Improvement of slurry erosion resistance of martensite/ferrite duplex stainless steel by hot rolling

2010

Met. Mater. Int.

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Test samples of martensite/ferrite duplex stainless steels (M/Fss) were prepared using thermal-mechanical processes and their slurry erosion behaviors were systematically studied. Test results show that hot rolling is an attractive process for improving erosion resistance. This improvement is more evident at higher impinging angles and larger reduction ratios. The thermal-mechanical-treated samples exhibit higher slurry erosion resistance for all impinging angles compared to that obtained by conventional quenching treatment without rolling. The variation tendency of the erosion rate versus the impinging angle for samples rolled with different degrees of reduction is similar in that the erosion rate initially increases and then decreases as the impinging angles increase from 15° to 90°, reaching a maximum at approximately 30°. After impingement erosion, the surface morphologies of the samples exhibit many long furrows and ridges at a low impinging angle of 30°. At a high impinging angle of 90°, the samples exhibit a worn surface with abundant overlapping and irregular concavities. The surface hardness of the samples after impingement erosion increases as the impinging angles and reduction ratios increase due to the enhanced effects of both work hardening and the formation of straininduced martensite.

“…These procedures were also conducted in studying other martensitic SS elsewhere. 18) After hot rolling and tempering, at least 2 mm was machined off to remove the decarburization layer.…”

Section: Materials Preparation and Heat Treatmentmentioning

confidence: 99%

Influence of Hot Rolling and Post-Tempering on the Mechanical Properties of Duplex Stainless Steel Containing Martensite and Ferrite

2006

Mater. Trans.

Self Cite

In this research, SUS 403 duplex stainless steel containing martensite and ferrite was processed with hot rolling at a range of reductions (15-50%) and post-tempering at a range of temperatures (473-873 K) to investigate microstructural change during tempering and mechanical properties as a function of tempering temperature and ferrite grain size. The results indicate that Cr-rich carbides precipitate when tempering at the range of 473-773 K. The precipitation of fine carbides increases the carbide-ferrite phase boundary area. Again, the hard carbides reinforce the ferrite matrix along the boundaries and, consequently, results in enhancing mechanical properties. A secondary strengthening phenomenon in stress and hardness occurs at 773 K tempered. The ferrite grain size decreases with increasing reduction. Fine grain structure leads to an increase in grain boundaries and homogeneous dispersion of carbides, which provides a dominant action against crack propagation and improves the mechanical properties. Except the hardness, the maximum mechanical properties of each rolling reduction are better than that of the specimens quenched and tempered without hot rolling.