MICROSTRUCTURE, MECHANICAL PROPERTIES AND STRENGTHENING MECHANISMS OF A Cu BEARING LOW-CARBON STEEL TREATED BY Q&P PROCESS

被引：6

作者：

Yan Shu ^{[1
]}

Liu Xianghua ^{[1
,2
]}

Liu W J ^{[2
]}

Lan Huifang ^{[1
]}

Wu Hongyan ^{[1
]}

机构：

[1] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China

[2] Northeastern Univ, Res Acad, Shenyang 110819, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2013年 / 49卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Q&P process; retained austenite; Cu-rich particle; product of tensile strength and elongation; RETAINED AUSTENITE; PARTITIONING PROCESS; HEAT-TREATMENT; MARTENSITE; TRANSFORMATION; BAINITE; DESIGN; QUENCH;

D O I：

10.3724/SP.J.1037.2013.00176

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A low carbon steel containing Cu addition was treated by Q&P process using a CAS-200 continuous annealing simulator. The microstructure of the steel was characterized by means of SEM, EBSD, XRD and TEM and its mechanical properties were investigated by tensile testing at room temperature. Cu-rich precipitates formed during the Q&P process were observed as spherical particles in martensitic laths and are 9 nm to 20 nm in diameter. According to the Orowan mechanism, those fine particles may have a contribution to the yield strength of the steel about 134 MPa. Also observed are three different morphologies of the retained austenite phase in the test steel, i.e. thin film-like, fine granular and blocky, formed at different locations. The test steel has a good comprehensive mechanical properties, of which the product of tensile strength and elongation, the tensile strength and the total elongation are as high as 21.2 GPa.%, 1326 MPa and 16%, respectively. The excellent combined properties can be attributed to the effect of transformation induced plasticity (TRIP) caused by the retained austenite.

引用

页码：917 / 924

页数：8

共 26 条

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