【摘要】：高碳熱軋盤條被廣泛用于橋梁纜索用鍍鋅鋼絲、輪胎鋼簾線、切割鋼絲等高端金屬絲材的生產(chǎn)。合金元素Si、Mn作為高碳熱軋盤條的重要合金元素,對(duì)盤條及后續(xù)冷拔鋼絲的組織和性能具有極其重要的作用。本文以Si、Mn含量不同的高碳鋼為研究對(duì)象,探究了合金元素Si、Mn在珠光體轉(zhuǎn)變中的分配行為,并研究了其對(duì)盤條及冷拔鋼絲的微觀組織和性能的影響。首先研究了 Si、Mn元素在珠光體轉(zhuǎn)變過程中的分配規(guī)律。結(jié)果表明:在珠光體轉(zhuǎn)變中,Si元素主要分布在鐵素體中,并在滲碳體/鐵素體相界面處有富集,滲碳體相中基本不含Si元素。Mn元素在兩相中都有分布,但滲碳體相中的含量要明顯高于鐵素體相,Mn元素的分配主要受到鋼中Si含量及轉(zhuǎn)變溫度的影響。Si和Mn存在著交互作用,珠光體在較低溫度轉(zhuǎn)變時(shí),Si元素能夠促進(jìn)Mn向滲碳體相分配。隨著轉(zhuǎn)變溫度的升高,Si的促進(jìn)作用會(huì)相對(duì)減弱,Mn元素的分配受珠光體轉(zhuǎn)變溫度主導(dǎo)。對(duì)形變珠光體鋼絲的組織及性能的研究表明:Mn元素在滲碳體相中的富集提高了滲碳體在450℃時(shí)效過程中的穩(wěn)定性,延緩了滲碳體的球化速率,推遲了 450℃時(shí)效過程中時(shí)效軟化出現(xiàn)的時(shí)間,減少了熱鍍鋅過程中鋼絲強(qiáng)度的損失;Si元素能夠提高珠光體盤條的強(qiáng)度,但會(huì)降低鋼絲形變過程中的加工硬化率。
[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，

本文編號(hào)：2278023