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Microstructure Evolution during Annealing at Different Temperatures and Hot Deformation Behavior of Lean Duplex Stainless Steel 2101
Steel Research International ( IF 1.9 ) Pub Date : 2020-08-07 , DOI: 10.1002/srin.202000264
Haijian Xu 1, 2, 3 , Wanqing Hu 1 , Chao Kang 3 , Weijuan Li 1 , Xiaochun Sha 3
Affiliation  

Herein, the microstructure evolutions and mechanical properties of lean duplex stainless steel 2101 (LDX2101) are evaluated at different temperatures and a strain rate of 1 s−1. The experimental results show that the ratio of ferrite to austenite (α/γ) is increased between 950 and 1250 °C in total, but a turning temperature range occurs at 1000–1050 °C due to dissolution of the Cr2N precipitates along the phase boundaries. In LDX2101, high number density of Cr2N precipitates exist below 1000 °C and above 1100 °C, respectively. The morphologies of Cr2N precipitates change from massive to acicular with increasing temperatures. In addition, the excess strain is concentrated in α, and therefore strain is difficult to transfer to the adjacent γ. The aforementioned factors may lead to greater stress concentration along the phase boundaries (α/γ) and grain boundaries or grains (α), which causes edge cracking and surface cracking. With increase in deformation temperatures, the reduction of area increases and tensile strength decreases, but a turning temperature range occurs at 1000–1050 °C. The optimum hot deformation zone is in the temperature range of 1000–1100 °C by considering the precipitation temperature range of Cr2N precipitates. The formation mechanisms of Cr2N precipitates at different annealing temperatures are investigated.

中文翻译:

贫双相不锈钢2101在不同温度退火过程中的组织演变和热变形行为

在此,在不同的温度和1 s -1的应变速率下评估了贫双相不锈钢2101(LDX2101)的组织演变和力学性能。实验结果表明,在950至1250°C之间,铁素体与奥氏体的比例(α / γ)总体上有所增加,但是由于Cr 2 N析出物沿熔体的溶解而在1000–1050°C时出现了转变温度范围。相界。在LDX2101中,低于1000°C和高于1100°C分别存在高密度的Cr 2 N沉淀物。随着温度的升高,Cr 2 N析出物的形态从块状变为针状。此外,多余的应变集中在α,因此应变难以传递到相邻的γ。上述因素可能导致沿相界(α / γ)和晶界或晶粒(α)的应力集中更大,从而导致边缘开裂和表面开裂。随着变形温度的升高,面积的减小会增加,抗拉强度会降低,但车削温度范围会在1000–1050°C之间发生。考虑到Cr 2 N沉淀物的沉淀温度范围,最佳的热变形区在1000-1100°C的温度范围内。研究了不同退火温度下Cr 2 N析出物的形成机理。
更新日期:2020-08-07
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