TY - JOUR
T1 - Evaluating the mechanical behavior of electrochemically borided low-carbon steel
AU - Kartal Sireli, Guldem
AU - Bora, Asli Su
AU - Timur, Servet
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/15
Y1 - 2020/1/15
N2 - In this study, mechanical properties of borided low carbon steels were investigated with different testing methods namely tensile, Erichsen cupping and three-point bending tests along with fracture toughness and hardness measurements. For boriding, a new electrochemical based boriding called as CRTD-Bor (Cathodic Reduction and Thermal Diffusion based boriding) was chosen. The main advantages of CRTD-Bor are its high boride growth rate and its environmentally friendly nature. Cross-sectional scanning electron microscope inspections along with thin film X-ray diffraction analyses confirmed the fast boride layer formations (i.e. about 40 μm thick Fe2B layer in 5 min). On the other hand, some mechanical degradations were observed on the borided substrates such as decrease in yield and ultimate strength values. However, the improvement of flexural stress were detected which reached to 2.5 times higher after 30 min of boriding. The fracture toughness values were found as 0.44 MPa·m1/2, 1.34 MPa·m1/2 and 3.7 MPa·m1/2 for sole FeB, the interphase of FeB/Fe2B and Fe2B regions, respectively. Furthermore, the surface hardness of borided steels was measured around 1400 HV which exhibited excellent adhesion to the substrate as long as the boride layer composed of single Fe2B.
AB - In this study, mechanical properties of borided low carbon steels were investigated with different testing methods namely tensile, Erichsen cupping and three-point bending tests along with fracture toughness and hardness measurements. For boriding, a new electrochemical based boriding called as CRTD-Bor (Cathodic Reduction and Thermal Diffusion based boriding) was chosen. The main advantages of CRTD-Bor are its high boride growth rate and its environmentally friendly nature. Cross-sectional scanning electron microscope inspections along with thin film X-ray diffraction analyses confirmed the fast boride layer formations (i.e. about 40 μm thick Fe2B layer in 5 min). On the other hand, some mechanical degradations were observed on the borided substrates such as decrease in yield and ultimate strength values. However, the improvement of flexural stress were detected which reached to 2.5 times higher after 30 min of boriding. The fracture toughness values were found as 0.44 MPa·m1/2, 1.34 MPa·m1/2 and 3.7 MPa·m1/2 for sole FeB, the interphase of FeB/Fe2B and Fe2B regions, respectively. Furthermore, the surface hardness of borided steels was measured around 1400 HV which exhibited excellent adhesion to the substrate as long as the boride layer composed of single Fe2B.
KW - Boriding
KW - CRTD-Bor
KW - FeB
KW - FeB
KW - Mechanical properties
KW - Steel
UR - http://www.scopus.com/inward/record.url?scp=85075794454&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2019.125177
DO - 10.1016/j.surfcoat.2019.125177
M3 - Article
AN - SCOPUS:85075794454
SN - 0257-8972
VL - 381
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 125177
ER -