本文關(guān)鍵詞： 藥芯焊絲 堆焊合金 硬質(zhì)相 耐磨性能　出處：《沈陽工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：工業(yè)的快速發(fā)展對(duì)耐磨材料提出了更高的要求。在零部件的表面熔敷一層耐磨性較高的金屬層,可以有效提高其使用壽命。本文以傳統(tǒng)的Fe-Cr-C合金體系為基礎(chǔ),以Fe-Cr-C-B、Fe-Cr-C-B-Nb、Fe-Cr-C-B-Ti三種合金體系為研究對(duì)象,制備了多元復(fù)合強(qiáng)化耐磨堆焊藥芯焊絲。采用自保護(hù)明弧堆焊法制備堆焊層,探討了堆焊層中硬質(zhì)相的種類和分布形態(tài),分析了元素含量變化對(duì)堆焊層硬度和耐磨性的影響。在Fe-Cr-C-B系堆焊合金中,優(yōu)化了Cr元素的含量。并在此基礎(chǔ)上,研究硼元素加入對(duì)堆焊層顯微組織和耐磨性的影響。隨著硼元素的增加,顯微組織由M23C6向M_(23)(C,B)_6轉(zhuǎn)變,彌散分布的硼化物,呈層片狀、菊花狀等。耐磨性實(shí)驗(yàn)結(jié)果表明,適量的硼元素可改善Fe-Cr-C-B系堆焊合金的耐磨性,其耐磨性與硼化物數(shù)量,致密度和尺寸有關(guān)。在Fe-Cr-C-B-Nb系堆焊合金中,制備的堆焊合金顯微組織為馬氏體,殘余奧氏體,M_(23)(C,B)_6和NbC。硼化物M_(23)(C,B)_6沿晶界分布,NbC呈規(guī)則四邊形彌散分布在基體中。NbC先于M_(23)(C,B)_6生成。過量的B元素不利于NbC析出,使Nb元素固溶強(qiáng)化硼化物和基體。耐磨性實(shí)驗(yàn)結(jié)果表明,M_(23)(C,B)_6和NbC兩種硬質(zhì)相顯著改善了Fe-Cr-C-B-Nb系堆焊合金的耐磨性。在Fe-Cr-C-B-Ti系堆焊合金中,堆焊層中原位合成了TiC和M_(23)(C,B)_6兩種硬質(zhì)相。隨著鈦含量的增加,顯微組織中TiC的數(shù)量逐漸增加,并沿晶界分布。硼含量的提高,使TiC的數(shù)量不穩(wěn)定。TiC作為形核襯底,為M_(23)(C,B)_6附生生長(zhǎng)提供條件。原位合成TiC和M_(23)(C,B)_6兩種硬質(zhì)相,可提高堆焊層的綜合性能。
[Abstract]:The rapid development of industry has put forward higher requirements for wear-resistant materials. A metal layer with high wear resistance is deposited on the surface of parts and components. This paper is based on the traditional Fe-Cr-C alloy system and Fe-Cr-C-Bnb Fe-Cr-C-B-Nb. Three kinds of Fe-Cr-C-B-Ti alloy systems were used to prepare multicomponent composite and wear-resistant surfacing flux-cored wire and self-protective bright arc surfacing method was used to prepare surfacing layer. The types and distribution of hard phases in surfacing layer were discussed, and the effect of element content on hardness and wear resistance of surfacing layer was analyzed. In Fe-Cr-C-B surfacing alloy. The content of Cr was optimized. On this basis, the effect of boron addition on the microstructure and wear resistance of surfacing layer was studied. With the increase of boron element, the microstructure changed from M23C6 to M2C23C. The results of wear resistance test showed that the appropriate amount of boron could improve the wear resistance of Fe-Cr-C-B surfacing alloy. The wear resistance is related to the quantity, density and size of boride. In the Fe-Cr-C-B-Nb surfacing alloy, the microstructure of the surfacing alloy is martensite and residual austenite. M / C / C / C / C / B / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C /. NbC is distributed in matrix as regular quadrilateral dispersion. NbC is formed earlier than M _ S _ 2O _ 3 / C _ B _ 6. Excessive B element is not conducive to the precipitation of NbC. The solid solution of NB element was used to strengthen the boride and matrix. The wear resistance of Fe-Cr-C-B-Nb surfacing alloys was improved remarkably by two hard phases, BX _ 6 and NbC. In Fe-Cr-C-B-Ti surfacing alloys, the wear resistance of the surfacing alloys was improved. In the surfacing layer, two kinds of hard phases, TiC and M _ (+ +) _ (23) C ~ (+ +) C ~ (2 +), were synthesized in situ. With the increase of titanium content, the amount of TiC in microstructure increased gradually. With the increase of boron content along grain boundaries, the quantity of TiC is unstable. Tic is used as nucleation substrate. In situ synthesis of two hard phases, TiC and MK23, can improve the comprehensive properties of the surfacing layer.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG455

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本文編號(hào)：1492302