Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

Abstract

The purpose of the research was to obtain an arc welded joint of a preliminary quenched high-carbon wear resistant steel without losing the structure that is previously obtained by heat treatment. 120Mn3Si2 steel was chosen for experiments due to its good resistance to mechanical wear. The fast cooling of welding joints in water was carried out right after welding. The major conclusion is that the soft austenitic layer appears in the vicinity of the fusion line as a result of the fast cooling of the welding joint. The microstructure of the heat affected zone of quenched 120Mn3Si2 steel after welding with rapid cooling in water consists of several subzones. The first one is a purely austenitic subzone, followed by austenite + martensite microstructure, and finally, an almost fully martensitic subzone. The rest of the heat affected zone is tempered material that is heated during welding below A1 critical temperature. ISO 4136 tensile tests were carried out for the welded joints of 120Mn3Si2 steel and 09Mn2Si low carbon steel (ASTM A516, DIN13Mn6 equivalent) after welding with fast cooling in water. The tests showed that welded joints are stronger than the quenched 120Mn3Si2 steel itself. The results of work can be used in industries where the severe mechanical wear of machine parts is a challenge.

Microstructural and Mechanical Properties of B-Cr Coatings Formed on 145Cr6 Tool Steel by Laser Remelting of Diffusion Borochromized Layer Using Diode Laser

“…The highest intensity and increased number of peaks of the obtained phases occur in the angular range of 35 • to 55 • . The resulting phases correspond to the phases that can be read from the Fe-Cr-B, Fe-CB, and Cr-BC phase equilibrium diagrams and correspond to the results of other researchers who take up this problem [43][44][45].…”

Elucidating the Effect of Step Cooling Heat Treatment on the Properties of 2.25 Cr–1.0 Mo Steel Welded with a Combination of GMAW Techniques Incorporating Metal-Cored Wires

“…Cr-Mo steels possess good weldability for most processes, however, these alloys suffer from the temper embrittlement phenomenon when exposed to the temperature range of 370-550 • C over long periods [9]. There are several mechanisms for embrittlement out of which the two major phenomena reported by researchers are migration of impurity elements and changes in size and shape of carbides formed at the grain boundaries [10][11][12].…”

Microstructure and Mechanical Properties of Modern 11%Cr Heat-Resistant Steel Weld Joints

“…In the CGHAZ near the fusion line, the temperature is significantly above transition temperature A C3 [ 29 , 30 ]. High peak temperature of the welding cycle in the zone contributes to dissolution of precipitates in the matrix, mainly M 23 C 6 particles [ 29 , 31 , 32 ].…”

“…In turn, at the FGHAZ/ICHAZ, the peak temperature which is lower than for CGHAZ—slightly above A c3 for FGHAZ and between A c1 and A c3 for ICHAZ [ 20 , 30 ]. The peak temperature in these areas leads to partial dissolution of precipitates in the matrix [ 20 , 32 , 33 ].…”