Effect of deformation modes and heat treatment on microstructure and impact property restoration of internal crack healing in SA 508 steel

2020 ◽  
Vol 778 ◽  
pp. 139073 ◽  
Author(s):  
Yao Qiu ◽  
Ruishan Xin ◽  
Jianbin Luo ◽  
Qingxian Ma
Keyword(s):  
Heat Treatment ◽  
Impact Property ◽  
Internal Crack ◽  
Crack Healing ◽  
Deformation Modes

Effect of Heat Treatment on Microstructure and Hardness of Internal Crack Healing in a Low Carbon Steel

2017 ◽  
Vol 730 ◽  
pp. 3-7 ◽  
Author(s):  
Rui Shan Xin ◽  
Qing Xian Ma ◽  
Wei Qi Li
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Testing Machine ◽  
Low Carbon Steel ◽  
Internal Crack ◽  
Low Carbon ◽  
Crack Healing ◽  
Material Source ◽  
The Matrix ◽  
Healing Temperature

The effect of heat treatment on microstructure and hardness of internal crack healing in a low carbon steel was studied. The internal cracks were produced into the samples by a drilling and compression method. The microstructure of crack healing zone was examined using optical microscopy (OM) and scanning electron microscopy (SEM). The hardness of crack healing zone was measured using a Vickers micro-hardness testing machine (FM-800). The results show that healing temperature plays a more significant role in internal crack healing than holding time. Compared as-quenched samples with as-normalized samples under the same healing parameters, it is found that cooling speed is also an important factor for internal crack healing. The migration and enrichment of iron atoms provide material source for recrystallization and grain growth of crack healing zone. The existence of micro-voids leads to the hardness of the ferrite in the crack healing zone lower than that in the matrix.

scholarly journals The Effects of Homogenizing and Quenching and Tempering Treatments on Crack Healing

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 427
Author(s):  
Yao Qiu ◽  
Ruishan Xin ◽  
Jianbin Luo ◽  
Qingxian Ma
Keyword(s):  
Heat Treatment ◽  
Treatment Method ◽  
Internal Crack ◽  
Crack Healing ◽  
Percentage Recovery ◽  
Tempering Treatment ◽  
Deformation And Heat Treatment ◽  
The Impact ◽  
Heat Treatment Method ◽  
Quenching And Tempering

After thermal deformation and heat treatment, it can be observed that there are small, newly formed grains in the crack healing zone, which indicates that the internal crack is fully healed. However, in our previous study, the impact properties of the internal healing zone could only be partially healed. In this study, the process of homogenizing treatment was adopted to achieve grain size homogeneity. The effects of homogenizing treatment and quenching and tempering treatment on crack healing were also systematically analyzed. With the same heat treatment method, SA508-3 samples, which were subjected to multi-pass deformation, had a higher percentage recovery than those that underwent uniaxial compression. The percentage recovery of the crack healing zone was significantly improved after the process of homogenizing treatment. The impact property of the crack healing zone could be fully restored after homogenizing treatment followed by quenching and tempering treatment. However, after several episodes of heating, the grain-boundary strength decreased, and the impact value was relatively low.

scholarly journals Study on Mechanical Properties of crack Healing of low carbon Steel based on cyclic Phase Transformation Heat treatment

2021 ◽  
Vol 2133 (1) ◽  
pp. 012046
Author(s):  
Lei Chu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Crack Healing ◽  
Properties Of Materials ◽  
Metal Materials ◽  
Cyclic Phase

Abstract With the rapid development of materials, metal materials are used less and less, but at this stage, metal materials are still widely used, and iron and steel materials are the most widely used. Cracks often appear in the process of metal material processing and use, and these cracks will have a certain impact on the use of metal materials. The existence of microcracks will affect the mechanical properties of materials to some extent, but in most cases, the mechanical properties of materials will be greatly reduced, and in serious cases, metal materials will break directly in the process of use or processing. The crack healing process needed after the emergence of cracks can effectively change this situation, but so far, the research on metal crack healing is still not perfect. In this paper, taking the internal crack of low carbon steel as the object, the recovery of mechanical properties of low carbon steel by cyclic phase transformation heat treatment was studied. The results show that with the increase of the healing area, the microhardness of the area after crack healing also increases, and the tensile strength of the specimen also increases after the healing. When the healing area is similar, increasing the healing time and temperature will result in grain coarsening, resulting in the decrease of microhardness and tensile strength in the crack healing zone.

scholarly journals Analysis of Internal Crack Healing Mechanism under Rolling Deformation

PLoS ONE ◽  
2014 ◽  
Vol 9 (7) ◽  
pp. e101907 ◽  
Author(s):  
Haitao Gao ◽  
Zhengrong Ai ◽  
Hailiang Yu ◽  
Hongyan Wu ◽  
Xianghua Liu
Keyword(s):  
Internal Crack ◽  
Crack Healing ◽  
Rolling Deformation

Restoration of impact properties of internal crack healing in a low carbon steel

2017 ◽  
Vol 682 ◽  
pp. 433-440 ◽  
Author(s):  
Ruishan Xin ◽  
Qingxian Ma ◽  
Dongdong Guo ◽  
Weiqi Li
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Internal Crack ◽  
Low Carbon ◽  
Crack Healing ◽  
Impact Properties

Research on Crack Healing in Slab during Hot Rolling

2011 ◽  
Vol 264-265 ◽  
pp. 439-444
Author(s):  
Hai Liang Yu ◽  
Xiang Hua Liu
Keyword(s):  
Tensile Testing ◽  
Rolling Mill ◽  
Testing Machine ◽  
Fracture Morphology ◽  
Internal Crack ◽  
Rolled Steel ◽  
Crack Healing ◽  
Tensile Testing Machine ◽  
Experimental Rolling ◽  
Series Of Experiments

The elongation and the strength of rolled steel are severely affected by cracks in production. Reduction of cracks is important for the improvement of slab quality. In this paper, a series of experiments on internal crack healing in slab during rolling was carried out on the experimental rolling mill. The crack shape and the fracture morphology of the crack healing zones were observed by using the scanning electron microscope, and the shear strength of crack healing zone was tested through the tensile testing machine. With increase of the reduction ratio during rolling, the crack healing degree increases.

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