Microstructure Evolution and Mechanical Properties of Hot‐Rolled Medium Manganese TRIP Steels

Cai, Zhiping; Ding, Hua; Xue, Xin; Xin, Qibin; Jiang, Jun

doi:10.1002/9781118663547.ch113

Cited by 2 publications

(3 citation statements)

References 16 publications

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“…Generally speaking, during water quenching process, the cooling speed of the sample surface was faster than the core, and the shrinkage of surface was greater than that of core, causing the surface to bear compressive stress and the core to bear tensile stress. [30] Therefore, with increase in annealing temperature, the shrinkage was more severe, and the amount of recrystallization was reduced (as evidenced in Table 2), resulting in a higher residual stress, [31,32] which was further confirmed by comparing the KAM maps in Figure 5a,b. However, for the furnace-cooled samples, the cooling rate was low and roughly the same at different positions of samples.…”

Section: Methodsmentioning

confidence: 79%

“…It was proposed that the delay of martensitic transformation was contributed to the increase in TE. [ 32 ] During the stage II (in true strain range of 0.08–0.28), significant TRIP effect was triggered, and a large amount of martensite (42%) was produced. However, it is intriguing that WH was low and kept at a value of ≈2000 MPa (Figure 9b).…”

Section: Resultsmentioning

confidence: 99%

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The Significant Influence of Cooling Rate and Intercritical Annealing Temperature on Austenite Stability and Relationship to Mechanical Behavior in Medium Manganese Steel

Cai

Zhang

et al. 2022

steel research int.

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The influence of cooling rate and intercritical annealing temperature on austenite stability and mechanical properties of cold rolled Fe‐11Mn‐4Al‐0.2C steel are elucidated. The samples are intercritical annealed in the range of 700–900 °C for 5 min followed by either water‐quenched or furnace‐cooled. For 700–750 °C samples, the cooling rate has an insignificant influence on the mechanical properties. However, austenite in 800–900 °C water‐quenched samples is characterized by smaller grain size, lower Mn and C content and higher residual stress than the furnace‐cooled samples, which result in lower austenite stability, stronger transformation‐induced plasticity effect and higher ultimate tensile strength in water‐quenched samples. The specific contribution of factors relates to austenite stability is quantified. The contribution of grain size and elements is much higher than the residual stress. However, residual stress becomes a decisive factor because the opposite contribution of grain size and elements is almost offset.

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Section: Methodsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

The Significant Influence of Cooling Rate and Intercritical Annealing Temperature on Austenite Stability and Relationship to Mechanical Behavior in Medium Manganese Steel

Cai

Zhang

et al. 2022

steel research int.

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“…Finally, the dislocations need to bypass or cut through the precipitates to increase the strength of the matrix. It is worth noting that the grain size of the Nb/Mo precipitates increased in ferrite, dislocation lines, and γ/α grain boundaries [ 34 ].…”

Section: Resultsmentioning

confidence: 99%

Strengthening Mechanism and Carbide Precipitation Behavior of Nb-Mo Microalloy Medium Mn Steel

et al. 2021

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This study investigates the strengthening mechanism and carbide precipitation behavior of medium Mn steel with Nb-Mo microalloy after cyclic quenching and austenite reverse transformation treatment. The results show that the Nb/Mo element not only precipitates (Nb,Mo)C in the grains, hindering the movement of dislocations and increases the strength, but also segregates at the austenite/ferrite grain boundary, thus delaying the transformation from austenite to ferrite. In addition, a large amount of nano-scale cementite is retained after cyclic quenching and austenite reverse transformation, which has a positive effect on the proportion of retained austenite in medium Mn steel. Moreover, the carbides with small size and low Mn content are dissolved, and the decomposed C and Mn content are beneficial to the nucleation of austenite during the intercritical annealing process at a temperature of 690 °C.

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Microstructure Evolution and Mechanical Properties of Hot‐Rolled Medium Manganese TRIP Steels

Cited by 2 publications

References 16 publications

The Significant Influence of Cooling Rate and Intercritical Annealing Temperature on Austenite Stability and Relationship to Mechanical Behavior in Medium Manganese Steel

The Significant Influence of Cooling Rate and Intercritical Annealing Temperature on Austenite Stability and Relationship to Mechanical Behavior in Medium Manganese Steel

Strengthening Mechanism and Carbide Precipitation Behavior of Nb-Mo Microalloy Medium Mn Steel

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