N-induced microstructure refinement and toughness improvement in the coarse grain heat-affected zone of a low carbon Mo–V–Ti–B steel subjected to a high heat input welding thermal cycle

2021 ◽  
pp. 141799
Author(s):  
Huibing Fan ◽  
Genhao Shi ◽  
Tong Peng ◽  
Qiuming Wang ◽  
Leping Wang ◽  
...  
Keyword(s):  
Heat Affected Zone ◽  
Heat Input ◽  
Thermal Cycle ◽  
High Heat ◽  
Coarse Grain ◽  
Low Carbon ◽  
Microstructure Refinement ◽  
Welding Thermal Cycle ◽  
High Heat Input ◽  
Toughness Improvement

Effect of Heat Input on HAZ Properties and Microstructure of SMA490BW Corrosion Resistance Steel

2011 ◽  
Vol 337 ◽  
pp. 517-521
Author(s):  
Yuan Nie ◽  
Li Jun Wang ◽  
Chuan Ping Ma ◽  
Yong Hui Zhu ◽  
Da Li ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Impact Energy ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Thermal Cycle ◽  
Coarse Grain ◽  
Welding Thermal Cycle ◽  
Gleeble 3500 ◽  
The Impact ◽  
Small Content

Welding thermal cycle of SMA490BW corrosion resistance steel with different heat inputs were simulated by using Gleeble-3500 thermo-mechanical simulator to investigate the microstructure and impact toughness of the heat-affected zone (HAZ). The results shows that the microstructure of the coarse-grain heat affected zone(CGHAZ) is mainly composed of lath bainites and the surpass critical coarse-grain heat affected zone(SCCGHAZ) consists mainly of granular bainites with a small content of ferrites. The grain size increased with the heat input increasing, Besides, the impact energy of the surpass critical coarse-grain heat affected zone(SCCGHAZ) is higher than that of the coarse-grain heat affected zone(CGHAZ), when the heat input energy is 15kJ/cm after twice thermal cycle, the impact energy is highest.

scholarly journals Grain Refinement of Heat Affected Zone in High Heat Input Welding by Liquid Phase Pinning of Oxy-Sulfide

2015 ◽  
Vol 55 (9) ◽  
pp. 2018-2026 ◽  
Author(s):  
Takako Yamashita ◽  
Junji Shimamura ◽  
Kenji Oi ◽  
Masayasu Nagoshi ◽  
Katsunari Oikawa ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Grain Refinement ◽  
Heat Affected Zone ◽  
Heat Input ◽  
High Heat ◽  
High Heat Input

High Heat Input Welding of 12Cr-6Ni-2.5Mo Supermartensitic Stainless Steel

2003 ◽  
Author(s):  
Ragnhild Aune ◽  
Hans Fostervoll ◽  
Odd Magne Akselsen
Keyword(s):  
Weld Metal ◽  
Stainless Steels ◽  
Heat Affected Zone ◽  
Heat Input ◽  
High Heat ◽  
Maximum Heat ◽  
Final Microstructure ◽  
Girth Welding ◽  
High Heat Input ◽  
Longitudinal Seam

In conventional welding of 13% Cr supermartensitic stainless steels, the normal microstructure that forms on cooling is martensite. Although high heat input tends to give a certain coarsening of the final microstructure, the eventual accompanying loss in toughness is not known. The present study was initiated to examine the effect of heat input on weld metal and heat affected zone mechanical properties of a 12Cr-6Ni-2.5Mo grade. The results obtained showed that the notch toughness is low (25 J) and independent of heat input for the weld metal, while it is reduced with increasing heat input for fusion line and the heat affected zone locations. Subsequent post weld heat treatment gave a substantial increase in toughness for all notch locations. Based on these results, indications are that a specified maximum heat input is not applicable in welding of supermartensitic stainless steels, allowing more production efficient techniques to be used, both in longitudinal seam and girth welding.

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