合金元素分配对珠光体转变组织及性能的影响
发布时间：2018-10-17 21:21
【摘要】：高碳热轧盘条被广泛用于桥梁缆索用镀锌钢丝、轮胎钢帘线、切割钢丝等高端金属丝材的生产。合金元素Si、Mn作为高碳热轧盘条的重要合金元素,对盘条及后续冷拔钢丝的组织和性能具有极其重要的作用。本文以Si、Mn含量不同的高碳钢为研究对象,探究了合金元素Si、Mn在珠光体转变中的分配行为,并研究了其对盘条及冷拔钢丝的微观组织和性能的影响。首先研究了 Si、Mn元素在珠光体转变过程中的分配规律。结果表明:在珠光体转变中,Si元素主要分布在铁素体中,并在渗碳体/铁素体相界面处有富集,渗碳体相中基本不含Si元素。Mn元素在两相中都有分布,但渗碳体相中的含量要明显高于铁素体相,Mn元素的分配主要受到钢中Si含量及转变温度的影响。Si和Mn存在着交互作用,珠光体在较低温度转变时,Si元素能够促进Mn向渗碳体相分配。随着转变温度的升高,Si的促进作用会相对减弱,Mn元素的分配受珠光体转变温度主导。对形变珠光体钢丝的组织及性能的研究表明:Mn元素在渗碳体相中的富集提高了渗碳体在450℃时效过程中的稳定性,延缓了渗碳体的球化速率,推迟了 450℃时效过程中时效软化出现的时间,减少了热镀锌过程中钢丝强度的损失;Si元素能够提高珠光体盘条的强度,但会降低钢丝形变过程中的加工硬化率。
[Abstract]:High-carbon hot-rolled wire rod is widely used in the production of high-end wire for bridge cable such as galvanized wire, tire cord, cutting wire and so on. As an important alloy element of high carbon hot-rolled wire rod, alloy element Si,Mn plays an extremely important role in the structure and properties of wire rod and subsequent cold-drawn wire. In this paper, the distribution behavior of alloying element Si,Mn in pearlite transformation was studied with high carbon steel with different Si,Mn content, and its effect on microstructure and properties of wire rod and cold-drawn steel wire was studied. First, the distribution of Si,Mn elements in pearlite transition is studied. The results show that during the pearlite transition, Si is mainly distributed in ferrite, and enriched at the interface of cementite / ferrite, and no Si element is found in cementite phase. Mn element is distributed in both phases. However, the content of Mn in cementite phase is obviously higher than that in ferrite phase. The distribution of Mn element is mainly affected by the content of Si and transition temperature in steel. There is interaction between Si and Mn. When pearlite changes at low temperature, Si can promote the distribution of Mn to cementite. With the increase of transition temperature, the promotion of Si is relatively weakened, and the distribution of Mn elements is dominated by the pearlite transition temperature. The study on microstructure and properties of deformed pearlite steel wire shows that the enrichment of Mn element in cementite phase improves the stability of cementite during aging at 450 鈩，
本文编号：2278023
[Abstract]:High-carbon hot-rolled wire rod is widely used in the production of high-end wire for bridge cable such as galvanized wire, tire cord, cutting wire and so on. As an important alloy element of high carbon hot-rolled wire rod, alloy element Si,Mn plays an extremely important role in the structure and properties of wire rod and subsequent cold-drawn wire. In this paper, the distribution behavior of alloying element Si,Mn in pearlite transformation was studied with high carbon steel with different Si,Mn content, and its effect on microstructure and properties of wire rod and cold-drawn steel wire was studied. First, the distribution of Si,Mn elements in pearlite transition is studied. The results show that during the pearlite transition, Si is mainly distributed in ferrite, and enriched at the interface of cementite / ferrite, and no Si element is found in cementite phase. Mn element is distributed in both phases. However, the content of Mn in cementite phase is obviously higher than that in ferrite phase. The distribution of Mn element is mainly affected by the content of Si and transition temperature in steel. There is interaction between Si and Mn. When pearlite changes at low temperature, Si can promote the distribution of Mn to cementite. With the increase of transition temperature, the promotion of Si is relatively weakened, and the distribution of Mn elements is dominated by the pearlite transition temperature. The study on microstructure and properties of deformed pearlite steel wire shows that the enrichment of Mn element in cementite phase improves the stability of cementite during aging at 450 鈩，
本文编号：2278023
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