Microstructure-toughness relationship in the simulated CGHAZ of V-N microalloyed X80 pipeline steel

被引：6

作者：

Wang, Ming-Ming ^{[1
]}

Gao, Xiu-Hua ^{[1
]}

Song, Li-Ying ^{[1
]}

Zhu, Cheng-Lin ^{[1
]}

Misra, R. D. K. ^{[2
]}

Du, Lin-Xiu ^{[1
]}

机构：

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

[2] Univ Texas El Paso, Dept Met Mat & Biomed Engn, Lab Excellence Adv Steel Res, El Paso, TX 79968 USA

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2021年 / 37卷 / 12期

基金：

国家高技术研究发展计划(863计划);

关键词：

V-N microalloying; coarse-grained heat-affected zone; pipeline steel; acicular ferrite; M; A constituents; crack propagation; impact toughness; hardness; HEAT-AFFECTED ZONE; AUSTENITE GRAIN-SIZE; CHARPY IMPACT PROPERTIES; MECHANICAL-PROPERTIES; TRANSFORMATION BEHAVIOR; FERRITE TRANSFORMATION; CARBON; INPUT; VANADIUM; PRECIPITATION;

D O I：

10.1080/02670836.2021.1976950

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure evolution, hardness and impact toughness in the simulated coarse-grained heat-affected zone (CGHAZ) of a V-N microalloyed X80 pipeline steel were studied. The results indicated that the microstructure mainly consisted of bainitic ferrite, acicular ferrite and granular bainite. The area fraction and size of M/A constituents were increased with increasing heat input. As heat input increased from 15 to 60 kJ cm(-1), the hardness gradually decreased from 301 to 243 HV, and impact energy decreased from 284 to 33 J. Hardness in the CGHAZ was not sensitive to heat input. When the heat input exceeded 30 kJ cm(-1), the formation of coarse granular bainite and large-sized blocky M/A constituents resulted in the deterioration of impact toughness.

引用

页码：1047 / 1059

页数：13

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