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Effect of Intercritical Quenching on the Microstructure and Cryogenic Mechanical Properties of a 7 Pct Ni Steel
Cao, Hongwei; Luo, Xinghong; Zhan, Guofeng; Liu, Shi; Luo, XH (reprint author), Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
2017-09-01
Source PublicationSPRINGER
ISSN1073-5623
Volume48AIssue:9Pages:4403-4410
AbstractThe effects of variation in the intercritical quench temperature of quench, intercritical quench, and temper (QLT) heat treatments on the microstructure and cryogenic mechanical properties of a 7 pct Ni steel are presented. The intercritical temperatures were in the range of 923 K to 983 K (650 A degrees C to 710 A degrees C) and were followed by quenching. The microstructures as determined by optical microscope, scanning electron microscope, and transmission electron microscopy, and X-ray diffraction are presented, and the results of low-temperature mechanical property tests are given. It is shown that both the grain size and the martensite lath width increased as the intercritical quench temperature increased, while the measured amount of reversed austenite decreased with increasing temperature. Higher amounts of stabilizing elements, such as Ni and Mn, which can improve the stability of reversed austenite, were absorbed by intercritical quenching from 963 K and 983 K (690 A degrees C and 710 A degrees C) than from 923 K and 943 K (650 A degrees C and 670 A degrees C). Both the stability and the amount of reversed austenite had critical effects on the cryogenic mechanical properties of the steel. An excellent combination of cryogenic strength and toughness was achieved by intercritical quenching from 963 K (690 A degrees C), indicating that based on the cryogenic mechanical properties, 7 pct Ni-QLT steel could be used in place of 9 pct Ni steel for liquefied natural gas projects.; The effects of variation in the intercritical quench temperature of quench, intercritical quench, and temper (QLT) heat treatments on the microstructure and cryogenic mechanical properties of a 7 pct Ni steel are presented. The intercritical temperatures were in the range of 923 K to 983 K (650 A degrees C to 710 A degrees C) and were followed by quenching. The microstructures as determined by optical microscope, scanning electron microscope, and transmission electron microscopy, and X-ray diffraction are presented, and the results of low-temperature mechanical property tests are given. It is shown that both the grain size and the martensite lath width increased as the intercritical quench temperature increased, while the measured amount of reversed austenite decreased with increasing temperature. Higher amounts of stabilizing elements, such as Ni and Mn, which can improve the stability of reversed austenite, were absorbed by intercritical quenching from 963 K and 983 K (690 A degrees C and 710 A degrees C) than from 923 K and 943 K (650 A degrees C and 670 A degrees C). Both the stability and the amount of reversed austenite had critical effects on the cryogenic mechanical properties of the steel. An excellent combination of cryogenic strength and toughness was achieved by intercritical quenching from 963 K (690 A degrees C), indicating that based on the cryogenic mechanical properties, 7 pct Ni-QLT steel could be used in place of 9 pct Ni steel for liquefied natural gas projects.
description.department[cao, hongwei] univ sci & technol china, dept mat sci & engn, 96 jinzhai rd, hefei 230026, anhui, peoples r china ; [cao, hongwei ; luo, xinghong ; liu, shi] chinese acad sci, inst met res, cas key lab nucl mat & safety assessment, 72 wenhua rd, shenyang 110016, liaoning, peoples r china ; [zhan, guofeng] wuhan iron & steel grp corp, res & dev ctr, 28 yejin rd, wuhan 430080, hubei, peoples r china
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationWISCO
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79133
Collection中国科学院金属研究所
Corresponding AuthorLuo, XH (reprint author), Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Cao, Hongwei,Luo, Xinghong,Zhan, Guofeng,et al. Effect of Intercritical Quenching on the Microstructure and Cryogenic Mechanical Properties of a 7 Pct Ni Steel[J]. SPRINGER,2017,48A(9):4403-4410.
APA Cao, Hongwei,Luo, Xinghong,Zhan, Guofeng,Liu, Shi,&Luo, XH .(2017).Effect of Intercritical Quenching on the Microstructure and Cryogenic Mechanical Properties of a 7 Pct Ni Steel.SPRINGER,48A(9),4403-4410.
MLA Cao, Hongwei,et al."Effect of Intercritical Quenching on the Microstructure and Cryogenic Mechanical Properties of a 7 Pct Ni Steel".SPRINGER 48A.9(2017):4403-4410.
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