Multiphase microstructure formation and its effect on fracture behavior of medium carbon high silicon high strength steel

2021 ◽  
Vol 72 ◽  
pp. 81-92
Author(s):  
Kui Chen ◽  
Huabing Li ◽  
Zhouhua Jiang ◽  
Fubin Liu ◽  
Congpeng Kang ◽  
...  
Keyword(s):  
High Strength Steel ◽  
Fracture Behavior ◽  
High Strength ◽  
Microstructure Formation ◽  
Medium Carbon ◽  
Multiphase Microstructure ◽  
High Silicon

Microstructural Evolution of Medium Carbon Steels during the Quenching and Partitioning Process

2010 ◽  
Vol 654-656 ◽  
pp. 86-89 ◽  
Author(s):  
Hong Yan Li ◽  
Xue Jun Jin
Keyword(s):  
Lath Martensite ◽  
High Strength Steels ◽  
High Strength ◽  
Lower Bainite ◽  
Carbon Steels ◽  
Medium Carbon ◽  
Quenching And Partitioning ◽  
Multiphase Microstructure ◽  
Advanced High Strength Steels ◽  
Medium Carbon Steels

The “Quenching and Partitioning” (Q&P) process is a novel heat treatment designed for processing new generation advanced high strength steels (AHSS) with substantial ductility. In this study, evolution of complex microstructure for medium carbon steels during the Q&P process has been discussed in detail. Such steels have shown a complex multiphase microstructure consisted of fresh lath-martensite, fresh plate-martensite, transition carbide and/or cementite, isothermal martensite/lower bainite, and second twin-martensite after the one-step Q&P process (with the identical quenching and partitioning temperature). The morphology for the microstructure at room temperature after the two-step Q&P process (with different quenching and partitioning temperatures) demonstrated a little different. The formation of different microstructure for these two processes and their correlation with the mechanical properties are discussed.

Effect of nickel and cobalt on the properties of medium-carbon high-strength steel

1975 ◽  
Vol 17 (2) ◽  
pp. 95-103 ◽  
Author(s):  
A. P. Gulyaev ◽  
V. N. Zikeev ◽  
R. K. Guseinov
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Medium Carbon

Investigation of ductile fracture behavior of lap-welded joints with 460 MPa steel

2017 ◽  
Vol 21 (9) ◽  
pp. 1376-1387 ◽  
Author(s):  
Gang Shi ◽  
Yufeng Chen
Keyword(s):  
Ductile Fracture ◽  
Welded Joints ◽  
High Strength Steel ◽  
Fracture Behavior ◽  
Steel Structures ◽  
High Strength ◽  
Welded Steel ◽  
Fracture Parameters ◽  
Tension Tests ◽  
Micromechanics Models

Fractures in welded connections usually occurred at Earthquake. The lap-welded joints are an important type of welded connections in high strength steel structures. In this article, the ductile fracture behavior of lap-welded joints has been studied experimentally and numerically with 460 MPa steel. A series of coupon tests were used to determine two corresponding weld materials (ER55-D2 and ER55-G) mechanical properties. Two micromechanics models (void growth model and stress-modified critical strain models) had been calibrated by circumferentially notched tension specimens and calculated the fracture parameters numerically, which had been applied in predicting in five lap-welded joints. The experimental study showed that the fracture mode of 460 MPa lap-welded joints exhibited plastic damage under the tension tests. Numerical analysis of the fracture parameters also showed that the ductile fracture behavior of lap-welded joint with ER55-G was better. The study establishes an accurate numerical model for analyzing the ductile fracture behavior of Q460 high strength steel lap-welded joints that is applicable in predicting the fracture failure of welded steel structures.

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