High hardness-toughness and wear resistance of white cast iron treated by a multicycle quenching-partitioning-tempering process

Figures & data

Figure 1. Cooling curves measured at different positions of white cast iron balls treated by three processes.

Figure 2. XRD spectra of the De-MQ-Sct, oil-quenching and NOR samples at 0.5R position.

Figure 3. Optical photographs (a, c, and e) and SEM photographs (b, d, and f) for NOR sample (a and b), Oil-quenching sample (c and d) and De-MQ-Sct sample (e and f).

Table 1. The volume fractions of phases in the samples treated, respectively, by three processes.

Process	Eutectic carbide	Secondary carbide	Pearlite	Retained austenite	Martensite
De-MQ-Sct	16.1	13.0	13.8	12.2	44.9
Oil-quenching	17.4	9.2		8.5	65.1
NOR	19.7	7.3	73.0

Figure 4. The radial hardness of the balls treated by the three processes.

Table 2. The impact toughness distributions of the samples treated by the three processes.

Process	Sample 1(J/cm^2)	Sample 2(J/cm^2)	Sample 3(J/cm^2)	Average value (J/cm^2)
De-MQ-Sct	13.1	12.5	12.2	12.6
Oil-quenching	4.5	5.2	4.8	4.8
NOR	2.6	2.1	2.3	2.33

Figure 5. Wear loss of three kinds of samples at different positions.