本文關(guān)鍵詞： ZCuSn10P1銅合金 流變擠壓 組織 工藝參數(shù) 力學(xué)性能　出處：《昆明理工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：銅合金的應(yīng)用領(lǐng)域廣泛,傳統(tǒng)液態(tài)成形由于其熔點(diǎn)較高,存在模具壽命短、產(chǎn)品能耗大、易氧化、吸氣等問(wèn)題,而銅合金半固態(tài)成形則有望降低模具溫度、提高模具壽命、降低能耗,提高產(chǎn)品性能,因此,開(kāi)展銅合金半固態(tài)成形技術(shù)具有重要的科學(xué)意義和使用價(jià)值。本文將冷軋-重熔應(yīng)變誘導(dǎo)熔化激活法的制漿工藝和擠壓鑄造工藝相結(jié)合,提出了一種新的流變擠壓鑄造工藝。設(shè)計(jì)內(nèi)加彈簧和擋料圈的模具進(jìn)行了流變擠壓鑄造銅合金軸套實(shí)驗(yàn),在定量澆注、制漿工藝與擠壓鑄造工藝間的銜接等方面進(jìn)行了嘗試。并以ZCuSn10P1銅合金軸套為研究對(duì)象,研究了成形工藝參數(shù)對(duì)軸套組織和性能的影響規(guī)律,本文的主要研究?jī)?nèi)容及研究結(jié)果如下:(1)流變擠壓鑄造ZCuSn10P1銅合金軸套過(guò)程中,沿著充型方向,組織內(nèi)液相增加,在垂直充型方向上,軸套里外兩端的液相比中間組織的液相偏高。隨著成形比壓增加,軸套組織的均勻性先變好后變差。隨著擠壓速率提高,軸套組織均勻性提高。在成形比壓250MPa、擠壓速率15mm/s時(shí),流變擠壓鑄造ZCuSn10P1銅合金軸套組織最均勻。(2)隨著成形比壓增加,初生固相平均晶粒尺寸和形狀因子先減小后增大;隨著擠壓速率提高,初生固相平均晶粒尺寸和形狀因子逐漸減小。在成形比壓250MPa、擠壓速率15mm/s時(shí),流變擠壓鑄造ZCuSn10P1銅合金軸套組織的初生固相平均晶粒尺寸和形狀因子最小,分別為83.3μm和1.59。(3)軸套組織越均勻,初生固相顆粒尺寸越小,力學(xué)性能越高。隨著成形比壓增大,軸套的力學(xué)性能先增加后減小;隨著擠壓速率提高,軸套力學(xué)性能逐漸提高。在成形比壓250MPa、擠壓速率15mm/s時(shí),軸套力學(xué)性能最好,抗拉強(qiáng)度為371.1MPa,延伸率為8.4%,與液態(tài)擠壓鑄件相比,其抗拉強(qiáng)度、延伸率分別提高了 55.9%、83.3%。(4)流變擠壓軸套與常規(guī)液態(tài)擠壓軸套的拉伸斷口形貌有較大的差異,液態(tài)擠壓件為脆性斷裂,強(qiáng)度和延伸率都較低。流變擠壓鑄造銅合金軸套的斷口形貌類(lèi)似,都屬于混合型斷口,在固相顆粒間液相較多的區(qū)域易產(chǎn)生沿晶脆性斷裂;在固相顆粒間液相較少的區(qū)域,則會(huì)同時(shí)產(chǎn)生穿晶脆性斷裂和韌性斷裂。
[Abstract]:Copper alloy is widely used in many fields. Due to its high melting point, short die life, high energy consumption, easy oxidation and inspiratory, semisolid forming of copper alloy is expected to reduce die temperature and improve die life. In order to reduce energy consumption and improve product properties, it is of great scientific significance and practical value to develop semisolid forming technology of copper alloy. In this paper, the pulping process of cold rolling and remelting strain induced melting activation method is combined with squeeze casting process. A new rheological squeeze casting process was proposed. The die with spring and stopper ring was designed to carry out the experiment of rheological squeeze casting copper alloy shaft sleeve, and the casting was carried out quantitatively. The connection between pulping process and squeeze casting process was attempted. The influence of forming process parameters on the structure and properties of ZCuSn10P1 copper alloy shaft sleeve was studied. The main contents and results of this paper are as follows: (1) in the process of rheological squeeze casting ZCuSn10P1 copper alloy sleeve, the liquid phase in the microstructure increases along the filling direction and increases in the vertical filling direction. The liquid phase of the inner and outer ends of the shaft sleeve is higher than that of the intermediate structure. With the increase of the forming pressure, the uniformity of the sleeve structure first improves and then becomes worse. With the increase of the extrusion rate, the uniformity of the sleeve structure increases. When the forming specific pressure is 250 MPA, the extrusion rate is 15 mm / s. The average grain size and shape factor of primary solid phase decreased firstly and then increased with the increase of extrusion rate, and the average grain size and shape factor increased with the increase of extrusion rate. The average grain size and shape factor of primary solid phase decreased gradually. When the forming pressure was 250 MPA and the extrusion rate was 15 mm / s, the average grain size and shape factor of ZCuSn10P1 copper alloy sleeve in rheological squeeze casting was the smallest. The microstructure of the sleeve is 83.3 渭 m and 1.59.93 渭 m, respectively. The smaller the size of the primary solid particles, the higher the mechanical properties. With the increase of the forming pressure, the mechanical properties of the sleeve increase first and then decrease, and with the increasing of extrusion rate, the mechanical properties of the sleeve increase firstly and then decrease with the increase of extrusion rate. The mechanical properties of the shaft sleeve are improved gradually. When the forming pressure is 250 MPA and the extrusion rate is 15 mm / s, the mechanical properties of the sleeve are the best, the tensile strength is 371.1 MPA, the elongation is 8.4%, and the tensile strength is higher than that of the liquid extrusion casting. The tensile fracture morphology of the rheological extrusion sleeve is different from that of the conventional liquid extrusion sleeve, and the liquid extrusion part is brittle fracture. The fracture surface morphology of rheological squeeze casting copper alloy sleeve is similar, which belongs to mixed fracture surface, and it is easy to produce intergranular brittle fracture in the region with more liquid phase between solid particles, while in the region with less liquid phase between solid particles, the fracture surface of the shaft sleeve is similar. Transgranular brittle fracture and ductile fracture will occur simultaneously.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TG249.2

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