Enhancement of mechanical properties by changing microstructure in the eutectoid steel

Zheng, Chengsi; Li, Longfei; Wangyue, Yang; Sun, Zhihui

doi:10.1016/j.msea.2012.07.105

Cited by 24 publications

(11 citation statements)

References 11 publications

(20 reference statements)

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“…However, compared with the reduction of grain size, the reduction of cementite particle size is more effective. The grain boundary area was increased significantly through refining the grain size, namely, the number of dislocation annihilation or dynamic recovery traps increased obviously, the dislocation will be annihilated drastically near the grain boundary during the deformation process . Therefore, the ability to accumulate dislocation of single‐phase ultrafine grain steel is poor, which results in it has a weak hardening ability and a low uniform elongation.…”

Section: Discussionmentioning

confidence: 99%

“…For 1045 carbon steel, both thinning of the thickness of lamellar cementite and decrease of the lamellar spacing of pearlite occur during heavy cold deformation, and it is more important that the lamellar cementite transform into nanometer particle. A soft fine‐grained matrix embedded with hard nano‐scale cementite particles, can improve the work hardening capability, and the 1045 carbon steel has a good strength‐plasticity synergy …”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Strength by Multiple Rolling at Room Temperature in the 1045 Steel Prepared by Aluminothermic Reaction

et al. 2019

steel research int.

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The effects of cold rolling on the microstructure and mechanical properties of 1045 steel prepared by aluminothermic reaction casting method are investigated. It is found that an ultrafine‐grained ferrite (α) + submicron/nano‐cementite particle (θ) structure is formed by rolling at room temperature with different thickness reduction. With the increase of thickness reduction, many lamella cementites are squeezed, a portion of cementite is crushed, the dislocation density increases, meanwhile the tensile strength is improved significantly. The underlying mechanisms of enhancing mechanical properties are analyzed, with a focus on the heterogeneous composite structure of a soft fine‐grained matrix embedded with hard nano‐scale cementite particles. The yield strength and ultimate tensile strength are increased from 256 MPa and 490 MPa (As‐casting) to 939 MPa and 956 MPa at 84% thickness reduction. The tensile strength of rolled steel with 70% thickness reduction is 1.5 times than common 1045 carbon steel, but it also has a considerable ductility, resulting from the enhancement caused by refined ferrite grains and cementite particles.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of Strength by Multiple Rolling at Room Temperature in the 1045 Steel Prepared by Aluminothermic Reaction

et al. 2019

steel research int.

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“…Likewise, such phenomena have also been reported in eutectoid steel during hot deformation. [ 30,31 ]…”

Section: Resultsmentioning

confidence: 99%

Impacts of Warm Equal‐Channel Angular Pressing on Microstructure and Mechanical Properties of Granular Pearlitic Steel

Xiong

Zhou

et al. 2020

steel research int.

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Equal‐channel angular pressing (ECAP) of granular pearlite high‐carbon steel at 650 °C via the Bc route is thoroughly investigated. Together with microstructural evolution investigated through scanning and transmission electron microscopies, microtensile and microhardness testing are conducted for their mechanical properties. After four passes of warm deformation, the formed ultra‐microduplex structure is found to contain both ferrite grains of size ≈0.45 μm and cementite particles with the diameter of ≈0.3 μm. The corresponding microhardness and tensile strength are observed to increase first, followed by a decrement with the number of deformations passes. Meanwhile, yield strength and yield ratio increase with the ECAP passes, along with a slight decrease in elongation. The fracture morphology also changes from many deep dimples before ECAP to many small dimples after ECAP application, denoting a typical ductile fracture of the pearlitic steel.

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“…The different mechanical properties were because of different sizes of ferritic grains and cementite particles in each steel. As far as the spheroidized steel is concerned, mechanical properties are determined by the sizes of ferrite grain and cementite particles, as well as the misorientation angle of ferritic grain boundaries and the distribution of cementite particles [44]. Cold deformation led to work hardening by introducing a large number of low-angle grain boundaries.…”

Section: Microstructure-mechanical Properties Relationshipmentioning

confidence: 99%

Tailoring Strength and Ductility of a Cr-Containing High Carbon Steel by Cold-Working and Annealing

Wang

Shen

Liu³

et al. 2019

Materials

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SEM, TEM characterizations, in combination with tensile tests, provided an intriguing observation that ultra-high-strength and good ductility could be achieved simultaneously by changing the ratio of large and small precipitates in high-carbon steel (1.0C-1.5Cr-0.31Mn-0.20Si, wt %). The high yield strength of 670 MPa, tensile-stress of 740 MPa, and good ductility (elongation of 26%) were obtained by adopting spheroidization annealing, cold rolling, recrystallization annealing, and cold drawing. This led to nanosized precipitates with a large ratio of big size to the small size of 0.28, promoting high dislocation storage of 1.39 × 1014 m−2. In addition, the finite element (FE) method was used to simulate the cold-rolling process, and the largest stress and strain were 830 MPa and 0.6 at a depth of 3 mm after the fourth pass of the 0.10C-1.50Cr steel, respectively. The stress and strain accumulation in the top layer was potentially caused by severe plastic deformation, as well as attrition rendered by the rollers. This explained the emergence of dense low-angle grain boundaries in the region close to the surface of the cold rolled steel.

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Enhancement of mechanical properties by changing microstructure in the eutectoid steel

Cited by 24 publications

References 11 publications

Enhancement of Strength by Multiple Rolling at Room Temperature in the 1045 Steel Prepared by Aluminothermic Reaction

Enhancement of Strength by Multiple Rolling at Room Temperature in the 1045 Steel Prepared by Aluminothermic Reaction

Impacts of Warm Equal‐Channel Angular Pressing on Microstructure and Mechanical Properties of Granular Pearlitic Steel

Tailoring Strength and Ductility of a Cr-Containing High Carbon Steel by Cold-Working and Annealing

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