Microstructural characterization of an as-quenched HSLA-100 plate steel via transmission electron microscopy

被引：27
作者：
Thompson, S. W. [1 ]
机构：
[1] Colorado Sch Mines, George S Ansell Dept Met & Mat Engn, Golden, CO 80401 USA
来源：
MATERIALS CHARACTERIZATION | 2013年 / 77卷
关键词：
HSLA-100; TEM; Martensite; Retained austenite; Electron diffraction; HEAT-AFFECTED ZONE; MECHANICAL-PROPERTIES; LATH MARTENSITE; MORPHOLOGY; CRYSTALLOGRAPHY;
D O I：
10.1016/j.matchar.2013.01.002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Detailed analysis of an HSLA-100 steel via transmission electron microscopy revealed a "fully" martensitic microstructure, despite a low carbon content of 0.06 mass%, a fine prior austenite grain size of about 10 gm, and a modest cooling rate of approximately 15 degrees C/s. Martensite laths typically contained a moderate-to-high dislocation content, and occasional regions of twinned martensite were observed. Laths were contained wholly within single grains of austenite, and about 5% austenite was present in the final as-cooled microstructure. Martensite crystals exhibited the Kurdjumov-Sachs orientation relationship with respect to the parent austenite phase, and multiple variants of this relationship were observed for adjacent packets. Autotempering of martensite resulted in a low volume fraction of cementite precipitates in the largest, first-formed laths. (C) 2013 Elsevier Inc. All rights reserved.
引用
收藏
页码：89 / 98
页数：10
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