Effect of TiC Particles Addition on Tribological Behavior of Ductile Iron

Abstract

In order to improve the wear resistance of ductile iron, different contents of TiC particles are added into ductile iron used lost foam casting and the tribological behavior of ductile iron is studied through a ballon-disk sliding test. It is found that with the increase of TiC content, the pearlite content gradually increases, which is attributed to TiC accelerating the diffusion of carbon atoms to cementite and promoting the heterogeneous nucleation of cementite. The increase of pearlite content and the second phase strengthening caused by TiC improve the hardness and tensile strength of ductile iron. Ductile iron has the best tensile strength (498 MPa) and hardness (168 HV1) with a TiC content of 1 wt.%. The wear resistance also increases with increasing TiC content. The wear volume is reduced from 0.14 mm 3 to 0.03 mm 3 , and the main wear mechanism changes from adhesive wear to abrasive wear. The oxide layer produced by frictional heat on the worn surface and the hardened layer produced by strain hardening on the subsurface further improve the wear resistance. Therefore, the wear resistance of ductile iron is affected by the changes of microstructure before and after wear.

Effect of Scanning Strategy on the Microstructure and Triboperformance of FeNiCrMo Coating Manufactured by Plasma Transferred Arc

“…Otherwise, the content and distribution of cementite are other factors affecting the hardness and wear resistance of the alloy coating. Combined with Figures 6 and 10, the microstructures of both coatings include cementite and martensite [38][39][40], and the cementite precipitated was granulose. In the sample fabricated by single track, the cementite precipitated along lath grain boundaries and a large amount of martensite was transformed and surrounded by the cementite.…”

“…The furrow cross-section of the sample fabricated by double track was rough, suggesting that abrasive wear was the predominant wear mechanism [37], as shown in Figure 8f. Compared with reference [38], it can be seen that the smooth width and depth of the grooves on the surface of the FeCrNiMo coating treated by PTA were lower than those of TiC particle reinforced ductile iron, no matter whether formed by single-or double-track treatment, which presented a better abrasive resistance than that of reference [38]. It can be further proved that the wear resistance of the ductile iron was enhanced using the prepared FeCrNiMo coating on it.…”

“…Compared to the sample fabricated by single track, the content of the block-like cementite in the sample fabricated by double track is larger and the amount of austenite transformed to martensite is smaller. During the friction and wear test, the contact probability between the ball and the cementite in the coating of the sample fabricated by double track is obviously higher than Combined with Figures 6 and 10, the microstructures of both coatings include cementite and martensite [38][39][40], and the cementite precipitated was granulose. In the sample fabricated by single track, the cementite precipitated along lath grain boundaries and a large amount of martensite was transformed and surrounded by the cementite.…”

Tribological properties of a novel iron‐based self‐lubricating composite

“…This is due to the wear debris gradually adhering to the friction surface, causing the roughness to increase. Therefore, the frictional torque rises, and the heat generated by friction increases 26 . The COF curve exhibits that the COF value is in a relatively stable state (0.005–0.008) during the hydrodynamic lubrication condition (after 0:20:58).…”

Mechanical properties prediction of ferrite ductile iron via machine learning

“…Ductile iron is widely used in all directions because of its excellent mechanical properties such as fatigue resistance [1], wear resistance [2,3] and good casting performance [4,5] and of its low production cost [6,7]. In recent years, with the rapid development of infrastructure construction, the demand for ductile iron parts in wind power, high-speed railways, engineering machinery and other industries has gradually increased.…”