Page 107 - 机械工程材料2025年第三期

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2022.

Effect of Heat Input on Microstructure and Properties of Welded Joint of Low
Temperature High Manganese Steel

GUO Guangfei, REN Minghao, JIANG Heng, WU Kai, WANG Zhifu, ZHANG Xiaohu

(Hefei General Machinery Research Institute Co., Ltd., Hefei 230031, China)

Abstract: With CHW-SMn submerged arc welding wire and CHF610 flux, low temperature high manganese
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steel was welded by submerged arc welding under different heat inputs (12.0, 16.0, 20.0 kJ · cm ). The effect of heat
input on the microstructure and properties of the joint was studied. The results show that under different heat inputs, the
weld microstructures were all composed of columnar crystal + precipitate, and the microstructures of the heat affected
zone were austenite with a small amount of inclusions and precipitetes. With the increase of heat input, the microstructure
of the heat affected zone was coarsened and the width of the coarse-grained zone increased. With the increase of heat
input, the strength and toughness of the welded joint decreased, and the microhardness of the weld decreased first and
−1
−1
then increased. When the heat input was 12.0 kJ · cm and 16.0 kJ · cm , no cracks were observed on the weld surface
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of the welded joint after bending, but cracks appeared when the heat input was 20.0 kJ · cm . The tensile and impact
fracture of the joints under different heat inputs showed dimple morphology, and the fracture modes were all ductile
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fracture. When the heat input was 12.0 kJ · cm , the mechanical properties of the welded joint were relatively good.
Key words: low temperature high manganese steel; heat input; microstructure; hardness; impact toughness

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