Study on Strain Hardening and Cryogenic Toughness of Marine 10Ni5CrMoV Steel during Tempering

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Tao Zou, Yan-Wu Dong, Zhou-Hua Jiang, Li-Meng Liu
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引用次数: 0

Abstract

The tempering process is applied in marine 10Ni5CrMoV steel to study microstructure, and mechanical properties by multi-scale characterizations, strain hardening behavior, and cryogenic toughening mechanism are further investigated. As the tempering temperature increases from 590 to 630 °C, the dislocation density decreases by up to 25% and the austenite volume fraction decreases by up to 35%. Additionally, the morphology of austenite changes from strip to bulk, which weakened the pinning effect on the laths, leading to a coarsened martensite and an increase in the equivalent grain size. Based on the modified Crussard–Jaoul analysis, the specimens at different tempering temperatures exhibit a single-stage strain hardening behavior during plastic deformation. The increase in strength is attributed to the continuous transformation-induced plasticity effect and the increasing dislocation density. Furthermore, high austenite volume fraction and the proportion of grain boundary misorientation above 45° promote the release of stress concentration and hinder the propagation of cracks. This results in an increase in the ductile–brittle transition temperature (DBTT) of the specimens from −105 to −135 °C. At a tempering temperature of 610 °C, the specimen demonstrates an outstanding balance between yield strength (868 MPa) and cryogenic toughness (DBTT of −135 °C).

船用 10Ni5CrMoV 钢在回火过程中的应变硬化和低温韧性研究
在船用 10Ni5CrMoV 钢中采用回火工艺研究微观结构,并通过多尺度表征进一步研究力学性能、应变硬化行为和低温韧化机理。随着回火温度从 590 °C 升高到 630 °C,位错密度最多可降低 25%,奥氏体体积分数最多可降低 35%。此外,奥氏体的形态从条状变为块状,削弱了对板条的销钉效应,导致马氏体变粗,等效晶粒尺寸增大。根据修正的 Crussard-Jaoul 分析,不同回火温度下的试样在塑性变形过程中表现出单级应变硬化行为。强度的增加归因于连续转变引起的塑性效应和位错密度的增加。此外,高奥氏体体积分数和高于 45° 的晶界错向比例促进了应力集中的释放,并阻碍了裂纹的扩展。这导致试样的韧性-脆性转变温度(DBTT)从-105 ℃升至-135 ℃。回火温度为 610 ℃ 时,试样在屈服强度(868 兆帕)和低温韧性(DBTT 为 -135 ℃)之间实现了出色的平衡。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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