工艺参数对316LN钢热轧mm级粗晶破碎细化的影响

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Da-shan Sui , Hai-ming Zhang , Hong-yang Zhu , Zhe Zhu , Zhen-shan Cui
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引用次数: 3

摘要

非均匀混晶组织是316LN奥氏体不锈钢大锻件的常见缺陷。在Gleeble-3500型热机械模拟机上进行等温压缩实验,研究工艺参数对热轧过程中毫米级粗粒破碎和细化的影响。实验结果表明,在1150℃时,MCG试样的应力远大于细晶(FG)试样,而在1200℃时,MCG试样与FG试样的应力差变小。在温度为1200℃、应变速率为0.01 s−1、还原率为50%的条件下,mcg可以很好地破碎和细化。同时,通过数值模拟研究了温度、应变和应变速率对微观组织演化的影响。实验和仿真结果综合表明,MCG导致变形阻力增大,变形不相容,在1200℃时可破碎细化,从1150℃到1200℃,塑性变形能随温度升高而显著降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of process parameters on fragment and refinement of millimeter-grade coarse grains for 316LN steel during hot cogging

The heterogeneous mixed-grain microstructure is a common defect for the heavy forging of 316LN austenitic stainless steel. Isothermal compression experiments were performed on a Gleeble-3500 thermo-mechanical simulator to investigate the effect of process parameters on the fragment and refinement of millimeter-grade coarse grains (MCGs) during hot cogging. The experimental results indicate that the stress of MCG specimens is much larger than that of fine grain (FG) ones at 1150 °C, while the stress difference between MCG and FG samples became smaller at 1200 °C. Moreover, the MCGs can be well fragmented and refined under the condition of temperature of 1200 °C, strain rate of 0.01 s−1, and reduction rate of 50%. Meanwhile, numerical simulations were conducted to study the influences of temperature, strain and strain rate on microstructure evolution. The results of experiments and simulations comprehensively demonstrate that the MCG results in the increase of deformation resistance and incompatibility of deformation, and it can be fragmented and refined at 1200 °C so that the plastic deformation energy decreases remarkably with the increase of temperature from 1150 to 1200 °C.

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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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