Stress-induced martensitic transformation in metastable austenite grains during nanoindentation investigation

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters Pub Date : 2021-06-07 DOI:10.1080/09500839.2021.1936258

B. He, X. Shang

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引用次数: 3

Abstract

ABSTRACT In general, the formation of martensite in the metastable austenite grains in steels during nanoindentation investigations is believed to be induced by strain as the plastic deformation of austenite takes place prior to the martensitic transformation. However, it is not clear whether the formation of martensite occurs without the prior initiation of plasticity (stress-induced martensitic transformation) during nanoindentation measurement. The present work demonstrates that the martensitic transformation can be triggered during elastic deformation of austenite under an ultralow load when the indenter is close to the annealing twin boundaries. The indentation pressure interacts with the martensite transformation strain, providing the mechanical interaction energy to overcome the nucleation barrier of the martensite embryo. The present work suggests that the annealing twin boundaries can also serve as the nucleation sites of martensite and the stress-induced martensitic transformation is possible during nanoindentation investigation.

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纳米压痕研究中亚稳奥氏体晶粒应力诱导马氏体转变

一般来说，在纳米压痕研究过程中，在钢的亚稳奥氏体晶粒中马氏体的形成被认为是由应变引起的，因为奥氏体的塑性变形发生在马氏体转变之前。然而，在纳米压痕测量中，马氏体的形成是否在没有塑性(应力诱导马氏体转变)的前提下发生尚不清楚。研究表明，在超低载荷作用下，当压头靠近退火孪晶边界时，奥氏体的弹性变形可触发马氏体相变。压痕压力与马氏体相变应变相互作用，为克服马氏体胚的成核屏障提供了机械相互作用能。本研究表明，退火孪晶界也可以作为马氏体的成核位点，在纳米压痕研究过程中，应力诱导马氏体转变是可能的。

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来源期刊

Philosophical Magazine Letters 物理-物理：凝聚态物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Philosophical Magazine Letters is the rapid communications part of the highly respected Philosophical Magazine, which was first published in 1798. Its Editors consider for publication short and timely contributions in the field of condensed matter describing original results, theories and concepts relating to the structure and properties of crystalline materials, ceramics, polymers, glasses, amorphous films, composites and soft matter. Articles emphasizing experimental, theoretical and modelling studies on solids, especially those that interpret behaviour on a microscopic, atomic or electronic scale, are particularly appropriate. Manuscripts are considered on the strict condition that they have been submitted only to Philosophical Magazine Letters , that they have not been published already, and that they are not under consideration for publication elsewhere.