Microstructural evolution and formation mechanism of bimodal structure of 0.2% carbon steel subjected to the heavy-reduction controlled rolling process

A cylindrical indenter was designed to simulate the roller and 304 stainless steel / Q235A carbon steel plate with different roughness were bonded together. The interfacial bonding behavior was investigated by SEM, ultrasonic “C” scanning detection and nanoindentation test. The result reveal that with the increase of contact pressure between interfaces, the atoms of dissimilar metals begin to diffuse across interfaces in some regions, then form island-like bonding regions, and eventually extend to the whole interface. There are no obvious cracks on the surface of stainless steel and carbon steel after deformation. The cold roll-bonding mechanism of stainless steel and carbon steel is that elements on both sides of the interface diffuse and form a shallow diffusion layer under pressure to ensure the joint strength, and the joint bonding strength is greater than the strength of carbon steel matrix. In addition, the surface morphology of base metal has a great influence on the interfacial bonding quality. The higher surface roughness values increases the hardening degree of rough peak, which makes real contact area difficult to increase and reduce the interfacial bonding quality.

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On a New Two‐Step Air Cooling Method Following Thermomechanically Controlled Rolling: Microstructural Evolution and Mechanical Properties of a High‐Strength Multiphase Medium Carbon Microalloyed Steel

steel research international ◽

10.1002/srin.202000563 ◽

2020 ◽

pp. 2000563

Author(s):

Hari Srinivasa Rao Magham ◽

Nandakumar Maheswari ◽

Kumar Dinesh ◽

Lakshmanan Vijayaraghavan ◽

Shanmugam Sankaran ◽

...

Keyword(s):

Mechanical Properties ◽

Microstructural Evolution ◽

Microalloyed Steel ◽

High Strength ◽

Controlled Rolling ◽

Air Cooling ◽

Multiphase Medium ◽

Medium Carbon ◽

Cooling Method ◽

Carbon Microalloyed

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Microstructure and Mechanical Properties of a Low-Carbon Steel Treated by One-Step Quenching and Partitioning Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1082.202 ◽

2014 ◽

Vol 1082 ◽

pp. 202-207 ◽

Cited By ~ 1

Author(s):

Shu Yan ◽

Xiang Hua Liu

Keyword(s):

Mechanical Properties ◽

Carbon Steel ◽

Microstructural Evolution ◽

Retained Austenite ◽

Uniform Elongation ◽

Low Carbon Steel ◽

Total Elongation ◽

Low Carbon ◽

Quenching And Partitioning ◽

Partitioning Time

A low carbon steel was treated by quenching and partitioning (Q&P) process, and a detailed characterization of the microstructural evolution and testing of mechanical properties were carried out. The resulted mechanical properties indicate that with the partitioning time increasing, the tensile strength decreases rapidly first and then remains stable, and the total elongation increases first then decreases. The investigated steel subjected to Q&P process exhibits excellent products of strength and elongation (17.8-20.6 GPa•%). The microstructural evolution of martensite matrix during the partitioning step was observed, and the morphology and content of retained austenite were characterized. The working hardening behavior of the samples was analyzed, and the retained austenite with higher carbon content contributes to the uniform elongation more effectively.

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