Characterization of M23C6 Carbides Precipitating at Grain Boundaries in 100Mn13 Steel

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 47; no. 10; pp. 4862 - 4868
• Main Authors: Xu, Zhenfeng, Ding, Zhimin, Dong, Linnan, Liang, Bo
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-10-2016
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Materials Science; Metallic Materials; Nanotechnology; Structural Materials; Surfaces and Interfaces; Thin Films; Carbide; M23C6 Carbide; Duplex Stainless Steel; Orientation Relationship; Austenite
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-016-3656-7

Characteristics of the formation, the interfacial structure, and the defects of M
23
C
6
carbides in 100Mn13 steel after 1323 K (1050 °C) solution treatment and subsequent aging treatment were investigated by transmission electron microscope (TEM). The results show that M
23
C
6
carbides precipitated on both sides of the grain boundaries. Each M
23
C
6
carbide particle possesses a coherent interface and the cube–cube orientation relationship with the one austenite grain which M
23
C
6
precipitated from. The orientation relationships between the M
23
C
6
carbides and the austenite matrix were determined as follows: (1) [211]
γ
‖
[211]
M23C6
, (
1
1
¯
1
¯
)
γ
‖
(
1
1
¯
1
¯
)
M23C6
, (02
2
¯
)
γ
‖
(02
2
¯
)
M23C6
, (2) [110]
γ
‖
[110]
M23C6
, (
1
¯
1
1
¯
)
γ
‖
(
1
¯
1
1
¯
)
M23C6
, (
1
¯
11)
γ
‖
(
1
¯
11)
M23C6
. The M
23
C
6
carbide also possesses an incoherent interface with the other austenite grain which the M
23
C
6
carbide grew into by ledge mechanism. The precipitation of the M
23
C
6
carbides along the boundaries can improve the hardness of the high-manganese steel to some extent. Besides, twinning and stacking faults were observed in M
23
C
6
carbides. The reports about twinning and stacking faults in the M
23
C
6
carbides have not been found.