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首页> 外文期刊>Materials Science and Engineering >The dependences of deformation temperature on the strain-hardening characteristics and fracture behavior of Mn-N bearing lean duplex stainless steel
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The dependences of deformation temperature on the strain-hardening characteristics and fracture behavior of Mn-N bearing lean duplex stainless steel

机译：变形温度对MN-N轴承瘦双相不锈钢应变硬化特性及断裂行为的依赖性

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摘要

The tensile properties and fracture behavior of lean duplex stainless steel (LDSS) containing Mn-N was investigated through tensile deformation by varying the deformation temperature from 353 K to 213 K. The ultimate tensile strength (UTS) and yield strength (YS) of the test LDSS increased continuously as the temperature was lowered from 353 K to 213 K. The total elongation (TE) did not decline smoothly as the temperature decreased, instead, the TE peaked at the room temperature (293 K). This temperature-dependent mechanical response was mainly associated with the kinetics of strain-induced martensite transformation (SIMT) in the metastable austenite (γ). A quantitative kinetic model of temperature-dependent SIMT was established, which indicates a positive relationship that the lower the deformation temperature, the faster the SIMT rate. With respect to the nucleation of strain-induced martensite, three modes were clearly manifested by the nucleation mechanism during tensile deformation at different temperature ranges. The first case corresponded to the direct transformation of γ→α′ at 213 K. The second mode of γ→ε→α dominated the SIMT at the 213 K-293 K range. The α'-martensite nucleated at the mechanical twinning interactions at 293-333 K, i.e., γ→Twins→α′, which corresponded to the third mode. Notably, as the test temperature was lowered, a continuous fracture mechanism transition gradually emerges from fully ductile to brittle. Microstructural observations from in-situ tensile tests and EBSD showed that damages at the ferrite/martensite (α′/α′) interface dominated at 293 K. At 213 K, besides the interfacial fractures that occurred at 293 K, cleavage-type fractures were also found inside ferrite and martensite. Void coalescence was mainly responsible for the ductile fractures over 353 K where SIMT was absent.
机译：通过改变从353k至213k的变形温度，通过拉伸变形来研究含有Mn-n的稀脂不锈钢（LDS）的拉伸性能和断裂行为。最终拉伸强度（UT）和屈服强度（Ys）当温度从353k降至213k时，测试LDS连续增加。随着温度降低，总伸长率（TE）不会平稳下降，而是在室温下达到峰值（293k）。该温度依赖性机械响应主要与亚稳奥氏体（γ）中应变诱导的马氏体转化（SIMT）的动力学相关。建立了温度依赖模拟的定量动力学模型，这表明了较低变形温度的正关系，即SIMT率越快。关于应变诱导的马氏体的成核，在不同温度范围的拉伸变形期间通过成核机理清楚地表现出三种模式。第一种情况对应于213k的γ→α'的直接变换。γ→ε→α的第二模式在213 k-293k范围内主导了模拟。在293-333k，即γ→双胞胎→α'的293-333k，即γ→双胞胎→α'时核对α'''''''''''''''-马氏体。值得注意的是，随着测试温度降低，连续的骨折机理转变逐渐从完全延性到脆性出现。原位拉伸试验和EBSD的微观结构观测表明，在293k处以293K在293k处支配的铁氧体/马氏体（α'/α'）界面的损伤除了在293k时发生的界面骨折，切割型骨折还发现了内铁素体和马氏体。空隙聚结主要负责353 k的延性骨折，其中不存在。

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  • 来源
    《Materials Science and Engineering》 |2021年第5期|141440.1-141440.14|共14页
  • 作者

    Qixiang Jia; Yongxin Wang; Ruixue Mei; Lei Chen; Shuo Hao; Huanyu Zhang; Xiaocong Ma; Zongyuan Zou; Miao Jin;

  • 作者单位

    School of Mechanical Engineering Yanshan University Qinhuangdao 066004 PR China;

    School of Mechanical Engineering Yanshan University Qinhuangdao 066004 PR China;

    Manufacturer of High-Speed Precision Machining Centers Beijing Jingdiao Group Beijing 100000 PR China;

    School of Mechanical Engineering Yanshan University Qinhuangdao 066004 PR China;

    School of Mechanical Engineering Yanshan University Qinhuangdao 066004 PR China;

    School of Mechanical Engineering Yanshan University Qinhuangdao 066004 PR China;

    School of Mechanical Engineering Yanshan University Qinhuangdao 066004 PR China;

    School of Mechanical Engineering Yanshan University Qinhuangdao 066004 PR China;

    School of Mechanical Engineering Yanshan University Qinhuangdao 066004 PR China;

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  • 正文语种 eng
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  • 关键词

    Lean duplex stainless steel; Deformation temperature; Strain-induced martensite transformation; Fracture mechanism;

    机译：瘦双面不锈钢;变形温度;应变诱导的马氏体转化;骨折机制;

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