The dependences of deformation temperature on the strain-hardening characteristics and fracture behavior of Mn–N bearing lean duplex stainless steel

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

doi:10.1016/j.msea.2021.141440

Cited by 15 publications

(3 citation statements)

References 46 publications

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“…The crack path of tested specimens resulted in a typical brittle quasi-cleavage fracture surface in the ferritic phase, following by induction of microcracks in the austenite grain crossing the ferritic-austenitic boundary. Finally, the crack propagates through the austenite grain [17,18,38,41,45,46]. Challa et al [39] observed a similar behavior in austenitic stainless steels with a nanograins microstructure, and ultrafine grains with an average grain size of 320 nm, associating the deformation mechanism mainly to the deformation twins.…”

Section: Fractography Analysismentioning

confidence: 86%

“…The map of the deformed ferrite (blue areas, Figure 4) shows a substructure consisting of cells or subgrains. Regions with a low QI inside the ferrite grains can be defined as dislocation walls [17,18]. The KAM map of ferrite shows that the highest local misorientations are located at the γ/γ and γ/α interfaces and at in-grain cell boundaries, where high dislocation densities prevail.…”

Section: Microstructural Analysismentioning

confidence: 99%

“…The interaction of the martensite and ferrite generates an earlier necking, which will be discussed on the following sections, and corroborates with the decreases of total elongation compared with AR-T sample as could be seen in Table 3. In addition to the end strain induced martensite transformation [4,18,19,22,[32][33][34][35]37].…”

Section: Mechanical Properties Evaluationmentioning

confidence: 99%

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Work hardening analysis in a lean duplex stainless Steel 2304 after low deformation by cold rolling

Alves¹,

Rodrigues²,

Santos³

2022

Tecnol. Metal. Mater. Min.

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The deformation mechanism of lean duplex stainless steel (LDSS) is overly complex not only by their dual phase microstructure, but also due to metastable austenite, which can deform by different mechanisms and transform to martensite by strain. The purpose of this study was to investigate the mechanisms of deformation by tensile test on low deformed cold-rolled samples (4%-22%) of a 2304 LDSS. The microstructure was analyzed by X-ray diffraction, optical microscopy, electron backscattered diffraction and transmission electron microscopy. It was observed the formation of mechanical twinning, ε-martensite, and α'-martensite which evidenced the TRIP effect. The strain hardening rate was calculated and analyzed by Holomon and Crussard-Jaoul modeling together with instantaneous strain hardening exponent, and three operating mechanisms were observed: twinning, dislocations slipping, and strain induced martensite formation (SIM). Brass texture had compromised SIM transformation. The fractography analysis of tensile specimens showed quasi-cleavage occurrence, and dimples formation for this range of pre-deformation.

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