Regulation of Secondary Carbide Characteristics and Its Effect on Wear Resistance of High Carbon High Alloy Martensitic Steel

doi:10.12068/j.issn.1005-3026.2024.04.005

Abstract

Abstract:

The size and content of secondary carbide have an important effect on the mechanical properties and wear resistance of high carbon high alloy martensitic steel. In this paper， the evolution behavior of secondary carbide during forging and spheroidizing annealing process were studied by scanning electron microscope and transmission electron microscope， and its effects on mechanical properties and wear resistance of high carbon high alloy martensitic steel were also studied with abrasion wear testing machine. The results show that spheroidizing annealing significantly increases the content and size of secondary carbide in forged and air?cooled steel. The secondary carbide refine the austenite grain size by pinning grain boundary and reduce the solid solution content of alloying elements in martensite， which effectively improves the impact toughness of experimental steel. The micron?sized secondary carbide and ductile martensite matrix hinder abrasive cutting and reduce the microscopic fracture on worn surface effectively， which improves the wear resistance of experimental steel.

Key words: high carbon high alloy martensitic steel, secondary carbide, hardness, impact toughness, wear resistance

CLC Number:

TG 142.1

Jin-zhe JIANG, Yue LIU, Chun-ming LIU. Regulation of Secondary Carbide Characteristics and Its Effect on Wear Resistance of High Carbon High Alloy Martensitic Steel[J]. Journal of Northeastern University(Natural Science), 2024, 45(4): 490-498.

Figures/Tables 14

Table 1 Chemical composition of experimental steel(mass fraction)

C	Si	Mn	Cr	Mo	V	Ni	W	Nb	P	S
0.85	0.90	0.43	6.76	1.82	0.30	0.85	0.35	0.25	0.005	0.02

Fig.1 Process of spheroidizing annealing and quenching and tempering treatments

Fig.2 SEM images of experimental steel S1 after hot forging

Fig.3 SEM images of the experimental steel after spheroidizing annealing

Fig.4 TEM image and EDS energy spectrum of secondary carbide in experimental steel S2

Fig.5 CCT curves of experimental steel

Fig.6 SEM images of experimental steels after quenched at 1 025 °C

Fig.7 SEM images of experimental steels after tempered at 550 °C

Fig.8 Volume fraction and average size of secondary carbide in experimental steels before and after austenitizing

Fig.9 Phase volume fractions in experimental steels held at 850 °C for 4 h and 1 025 °C for 1.5 h respectively calculated with JmatPro software

Fig.10 XRD patterns of S1 and S2 experimental steels after quenching and tempering

Fig.11 Hardness and impact energy of S1 and S2 experimental steels after heat treatment

Fig.12 Weight loss and friction coefficient of S1 and S2 experimental steels

Fig.13 SEM images of worn surface morphology

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