Evolution of Pearlite Microstructure in Low-Carbon Cast Microalloyed Steel Due to the Addition of La and Ce

被引：22
作者：
Torkamani, H. [1 ]
Raygan, Sh [1 ]
Garcia-Mateo, C. [2 ]
Rassizadehghani, J. [1 ]
Palizdar, Y. [3 ]
San-Martin, D. [2 ]
机构：
[1] Univ Tehran, Coll Engn, Sch Met & Mat Engn, Tehran 111554563, Iran
[2] CSIC, Natl Ctr Met Res CENIM, Materalia Res Grp, Avda Gregorio Amo 8, Madrid 28040, Spain
[3] Mat & Energy Res Ctr, Karaj 3177983634, Iran
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2018年 / 49A卷 / 10期
关键词：
CONTROLLED PRECIPITATE GROWTH; AUSTENITE GRAIN-GROWTH; RARE-EARTH-ELEMENTS; IMPACT TOUGHNESS; MECHANICAL-PROPERTIES; ALLOYING ELEMENTS; FRACTURE-TOUGHNESS; EUTECTOID STEEL; KINETICS; STRENGTH;
D O I：
10.1007/s11661-018-4796-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of rare earth elements (RE) addition on the pearlite microstructure in low-carbon microalloyed steels have been investigated under two heat treatment conditions: (1) a normalizing treatment (as a conventional heat treatment used industrially to obtain the final mechanical properties of such steels), and (2) an isothermal treatment at 650 degrees C. This research reports the following effects due to the addition of RE: (i) refinement of the nodule and colony size of pearlite along with the ferrite grain size in the normalized condition, without a significant change in the volume fraction of pearlite. This microstructural refinement observed at room temperature is a consequence of the refinement of cast and austenitic microstructures formed during cooling in the presence of RE; (ii) the interlamellar spacing of pearlite isothermally transformed at 650 degrees C, as observed by SEM and TEM, is effectively reduced in the RE-added steel. This is likely due to two different effects combined: (i) direct influence of RE on atom carbon diffusion; and (ii) pearlite growth being boundary diffusion controlled by RE partitioning. (C) The Minerals, Metals & Materials Society and ASM International 2018
引用
收藏
页码：4495 / 4508
页数：14
相关论文
共 79 条
[1]   Pinning Effect of Cerium Inclusions during Austenite Grains Growth in SS400 Steel at 1300 °C: A Combined Phase Field and Experimental Study [J].
Adabavazeh, Zary ;
Hwang, Weng-Sing ;
Dezfoli, Amir R. A. .
CRYSTALS, 2017, 7 (10)
[2]   PEARLITE GROWTH-KINETICS AND PARTITIONING IN A CR-MN EUTECTOID STEEL [J].
ALSALMAN, SA ;
LORIMER, GW ;
RIDLEY, N .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1979, 10 (11) :1703-1709
[3]  
[Anonymous], MET MAT INT
[4]   Effect of Prior Austenite Grain Size on Pearlite Transformation in a Hypoeuctectoid Fe-C-Mn Steel [J].
Aranda, M. M. ;
Kim, B. ;
Rementeria, R. ;
Capdevila, C. ;
Garcia De Andres, C. .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2014, 45A (04) :1778-1786
[5]  
Atkins M., 1980, ATLAS CONTINUOUS COO
[6]  
Bhadeshia HKDH, 2017, STEELS: MICROSTRUCTURE AND PROPERTIES, 4TH EDITION, P101, DOI 10.1016/B978-0-08-100270-4.00004-4
[7]   Characterization and morphological analysis of pearlite in a eutectoid steel [J].
Caballero, FG ;
de Andrés, CG ;
Capdevila, C .
MATERIALS CHARACTERIZATION, 2000, 45 (02) :111-116
[8]   Modelling of isothermal formation of pearlite and subsequent reaustenitisation in eutectoid steel during continuous heating [J].
Caballero, FG ;
Capdevila, C ;
de Andrés, CG .
MATERIALS SCIENCE AND TECHNOLOGY, 2001, 17 (06) :686-692
[9]   Modeling of the interlamellar spacing of isothermally formed pearlite in a eutectoid steel [J].
Caballero, FG ;
Capdevila, C ;
de Andrés, CG .
SCRIPTA MATERIALIA, 2000, 42 (06) :537-542
[10]   THE KINETICS OF CELLULAR SEGREGATION REACTIONS [J].
CAHN, JW .
ACTA METALLURGICA, 1959, 7 (01) :18-28
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