scholarly journals Effects of Ti/Mo and Ti/Cu ratio on precipitation behavior of Ti-bearing steel: findings from experiments and critical patent analysis

2021 ◽  
Vol 15 ◽  
pp. 1430-1445
Author(s):  
Chih-Yuan Chen ◽  
Ya-Hui Lin ◽  
Po-Han Chiu ◽  
Zhen-Wei Chen ◽  
Wen-Shan Liu
Keyword(s):  
Bearing Steel ◽  
Patent Analysis ◽  
Precipitation Behavior

scholarly journals Complex Precipitates of TiN-MCx in GCr15 Bearing Steel

2019 ◽  
Author(s):  
Qianren Tian ◽  
Guocheng Wang ◽  
Xinghu Yuan ◽  
Qi Wang ◽  
Seetharaman Sridhar
Keyword(s):  
Volume Fraction ◽  
Early Stage ◽  
Nucleation Site ◽  
Bearing Steel ◽  
Precipitation Behavior ◽  
Heterogeneous Nucleation Site ◽  
Bearing Steels ◽  
Advancing Front ◽  
Gcr15 Bearing Steel ◽  
Second Phases

Nitride and carbide are the second phases which play an important role in the performance of bearing steel, and their precipitation behavior is complicated. In this study, TiN-MCx precipitations in GCr15 bearing steels were obtained by non-aqueous electrolysis, and their precipitation mechanisms were studied. TiN is the effective heterogeneous nucleation site for Fe7C3 and Fe3C, therefore, MCx can precipitate on the surface of TiN easily, its chemistry component consists of M3C and M7C3 (M = Fe, Cr, Mn) and Cr3C2. TiN-MCx with high TiN volume fraction, TiN forms in early stage of solidification, and MCx precipitates on TiN surface after TiN engulfed by the solidification advancing front. TiN-MCx with low TiN volume fraction, TiN and MCx form in late stage of solidification, TiN can not grow sufficiently and is covered by a large number of precipitated MCx particles.

Analysis of precipitation behavior of MnS in sulfur-bearing steel system with finite-difference segregation model

2018 ◽  
Vol 25 (8) ◽  
pp. 803-812 ◽  
Author(s):  
De-lin Hu ◽  
Hui Liu ◽  
Jian-bo Xie ◽  
Juan Cheng ◽  
Jian Li ◽  
...  
Keyword(s):  
Finite Difference ◽  
Bearing Steel ◽  
Precipitation Behavior

Precipitation and Precipitation Hardening Behavior of V and/or Cu Bearing Middle Carbon Steels

2010 ◽  
Vol 638-642 ◽  
pp. 3491-3495 ◽  
Author(s):  
Takehide Senuma ◽  
Masanori Sakamoto ◽  
Yoshito Takemoto
Keyword(s):  
Carbon Steel ◽  
Precipitation Hardening ◽  
Bearing Steel ◽  
Carbon Steels ◽  
Precipitation Behavior ◽  
Hardening Behavior ◽  
Precipitation Treatment ◽  
Interphase Precipitation

In this study, the precipitation and precipitation hardening behavior of a 0.3%V and 2%Cu bearing middle carbon steel has been investigated in comparison with that of a 0.3%V bearing steel and a 2%Cu bearing steel. The precipitation treatment was carried out isothermally at 600°C.The amount of the precipitation hardening of the 0.3%V and 2%Cu bearing steel is nearly equal to the sum of the precipitation hardening of the 0.3%V bearing steel and the 2%Cu bearing steel In the 0.3%V bearing steel, precipitates were observed in rows, which indicates the occurrence of the interphase precipitation while precipitates observed in the 2%Cu bearing steel were randomly dispersed. In the V and Cu bearing steel, randomly dispersed precipitates were not observed where there were aligned precipitates. In the paper, the different precipitation behavior of the three steels is discussed.

The Study on the Precipitation Behavior of the Second Phase Particles for As-Hot Rolled Dual-Phase Nb-Bearing Steel

2011 ◽  
Vol 189-193 ◽  
pp. 626-629
Author(s):  
Zhang Hong Mei ◽  
Qiao Li Feng
Keyword(s):  
Bearing Steel ◽  
Second Phase ◽  
Dual Phase ◽  
Precipitation Behavior ◽  
Extraction Replica ◽  
Carbon Extraction Replica ◽  
Heating And Cooling ◽  
Second Phase Particles ◽  
The Matrix ◽  
Hot Rolled

The precipitation behavior of the second phase particles was observed and studied by a carbon extraction replica technique used transmission electron microscopy (TEM) for Nb-bearing dual-phase steel. It is found that there are more second phase particles on the surface than that of in the center of sample. The mainly smaller particle which sizes of is below 20nm show the shape of spherical and ellipse. The sizes of larger particles are range of 20nm~40nm and the shape of them present rectangle or ellipse. The particles are dispersed on the matrix and the particle boundary is clear. The precipitate composition of particles are all Nb(C、N) examined by energy dispersive X-ray (EDX). The results of microstructure shows that the second phase particles pinned on grain boundary not only can inhibited the grain growth, but also the grain can be fined during the heating and cooling course.

scholarly journals Complex Precipitates of TiN-MCx in GCr15 Bearing Steel

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 641
Author(s):  
Qianren Tian ◽  
Guocheng Wang ◽  
Xinghu Yuan ◽  
Qi Wang ◽  
Seetharaman Sridhar
Keyword(s):  
Volume Fraction ◽  
Early Stage ◽  
Nucleation Site ◽  
Bearing Steel ◽  
Precipitation Behavior ◽  
Heterogeneous Nucleation Site ◽  
Bearing Steels ◽  
Advancing Front ◽  
Gcr15 Bearing Steel ◽  
Second Phases

Nitride and carbide are the second phases which play an important role in the performance of bearing steel, and their precipitation behavior is complicated. In this study, TiN-MCxprecipitations in GCr15 bearing steels were obtained by non-aqueous electrolysis, and their precipitation mechanisms were studied. TiN is the effective heterogeneous nucleation site for Fe7C3 and Fe3C; therefore, MCxcan precipitate on the surface of TiN easily. The chemistry component of MCx consists of M3C and M7C3 (M = Fe, Cr, Mn) and Cr3C2. TiN-MCx with high TiN volume fraction, TiN forms in early stage of solidification, and MCx precipitates on TiN surface after TiN engulfed by the solidification advancing front. TiN-MCx with low TiN volume fraction, TiN and MCx form in late stage of solidification, TiN can not grow sufficiently and is covered by numerous precipitated MCxparticles.

scholarly journals Effect of Sulfur Content on the Composition of Inclusions and MnS Precipitation Behavior in Bearing Steel

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 570
Author(s):  
Hongliang Zhang ◽  
Guanghong Feng ◽  
Xin Liu ◽  
Baoshan Wang ◽  
Xuming Liu
Keyword(s):  
Sulfur Content ◽  
Solid Phase ◽  
Bearing Steel ◽  
Low Oxygen ◽  
Precipitation Behavior ◽  
Positive Role ◽  
Oxide Inclusions ◽  
Composition Control ◽  
Precipitation Temperature ◽  
Strip Shape

MnS inclusions in bearing steel have long been considered to significantly affect the fatigue life of bearing steel. In this paper, the sizes of inclusions in bearing steel with different sulfur contents were analyzed and the precipitation behavior of MnS was calculated using thermodynamics. Furthermore, the positive role of MnS in bearing steel was discussed. Results showed that when the size of inclusions in bearing steel was increased, the proportion of MnS components in composite inclusions gradually decreased. When the sulfur content was increased, the shape of inclusions changed from a particle shape to a strip shape. With increasing MnS content, the inclusion ratio of Al2O3 was significantly reduced in the Al2O3–CaO–MgO–MnS quaternary inclusion system, particularly for MnS proportions greater than 20%. The content of sulfur in bearing steel significantly affects the precipitation temperature of MnS. When sulfur content increases from 0.001% to 0.007%, the precipitation temperature of MnS increases from 1493 K to 1633 K as the precipitation of MnS moves from the austenite solid phase to the liquid and solid phases, and the precipitation size of MnS inclusions significantly increases. The size of oxide inclusions should be controlled to improve MnS wrap oxide inclusions in steel. Based on these results, a composition control with high sulfur levels and low oxygen levels should be adopted to improve the fatigue performance of steel.

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