Correlation between microstructure and impact toughness of weld heat-affected zone in 5 wt.% manganese steels

Li, Junhui; Wang, Honghong; Luo, Qi; Li, Li; Sun, Chao; Misra, R.D.K.

doi:10.1007/s42243-019-00274-2

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…The high yield strength of 650 MPa, ultimate strength of 770 MPa, and superior cryogenic toughness of around 200 J at −60 °C were obtained by optimized intercitical annealing. The transformation temperature was measured as Ac1 = 626 °C and Ac3 = 790 °C on a slow heating rate of 3 °C/min by Gleeble 3800 (Dynamic Systems Inc., Poestenkill, NY, USA) [15].…”

Section: Methodsmentioning

confidence: 99%

Role of Reversed Austenite Behavior in Determining Microstructure and Toughness of Advanced Medium Mn Steel by Welding Thermal Cycle

et al. 2018

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Reversed austenite transformation behavior plays a significant role in determining the microstructure and mechanical properties of heat affected zones of steels, involving the nucleation and growth of reversed austenite. Confocal Laser Scanning Microscope (CLSM) was used in the present work to in situ observe the reversed austenite transformation by simulating welding thermal cycles for advance 5Mn steels. No thermal inertia was found on cooling process after temperature reached the peak temperature of 1320 °C. Therefore, too large grain was not generated in coarse-grained heat-affected zone (CGHAZ). The pre-existing film retained austenite in base metal and acted as additional favorable nucleation sites for reversed austenite during the thermal cycle. A much great nucleation number led to the finer grain in the fine-grained heat-affected zone (FGHAZ). The continuous cooling transformation for CGHAZ and FGHAZ revealed that the martensite was the main transformed product. Martensite transformation temperature (Tm) was higher in FGHAZ than in CGHAZ. Martensite transformation rate was higher in FGHAZ than in CGHAZ, which is due to the different grain size and assumed atom (Mn and C) segregation. Consequently, the softer martensite was measured in CGHAZ than in FGHAZ. Although 10~11% austenite retained in FGHAZ, the possible Transformation Induced Plasticity (TRIP) effect at −60 °C test temperature may lower the impact toughness to some degree. Therefore, the mean absorbed energy of 31, 39 and 42 J in CGHAZ and 56, 45 and 36 J in FGHAZ were exhibited at the same welding heat input. The more stable retained austenite was speculated to improve impact toughness in heat-affected zone (HAZ). For these 5Mn steels, reversed austenite plays a significant role in affecting impact toughness of heat-affected zones more than grain size.

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Section: Methodsmentioning

confidence: 99%

Role of Reversed Austenite Behavior in Determining Microstructure and Toughness of Advanced Medium Mn Steel by Welding Thermal Cycle

et al. 2018

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Comparison of feasibility, microstructure and performance of hybrid laser arc, activated flux tungsten inert gas and friction stir welding for thick plate of innovative ultra-pure ferritic stainless steel

Han

Liu

Chen

et al. 2021

J. Iron Steel Res. Int.

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Wear and Friction Characteristics of 65Mn Steel for Spike-Tooth Harrow

Lü

Chen

et al. 2021

Coatings

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The friction and wear characteristics of spike-tooth material (65Mn steel) of Spike-Tooth Harrow in a two-stage peanut harvester were studied in this paper. The friction and wear tests of pin and disc on 65 manganese steel were carried out on the tribometer, then the wear loss and the friction coefficient were studied. The wear loss of the pin was acquired by calculating the mass of the pin before and after the experiment using an electronic balance. According to the actual working environment of peanut spring-finger, four variable parameters are set up: load, speed, soil moisture and soil type. The friction and wear characteristics of pins were studied under different loads, speeds and different soil environments. After wearing, the worn surface of the material was observed by scanning microscope and the wear mechanism was studied. The experimental results show that the wear of the pin increases with the increase of load and decreases with the increase of rotational speed in the same rotation number. Especially in the case of the sandy soil with 20% in moisture, a maximum wear loss of the pin is achieved.

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Correlation between microstructure and impact toughness of weld heat-affected zone in 5 wt.% manganese steels

Cited by 3 publications

References 28 publications

Role of Reversed Austenite Behavior in Determining Microstructure and Toughness of Advanced Medium Mn Steel by Welding Thermal Cycle

Role of Reversed Austenite Behavior in Determining Microstructure and Toughness of Advanced Medium Mn Steel by Welding Thermal Cycle

Comparison of feasibility, microstructure and performance of hybrid laser arc, activated flux tungsten inert gas and friction stir welding for thick plate of innovative ultra-pure ferritic stainless steel

Wear and Friction Characteristics of 65Mn Steel for Spike-Tooth Harrow

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