【摘要】：隨著軌道交通、隧道工程、風(fēng)電和汽車等高端裝備領(lǐng)域的高速發(fā)展,對(duì)軸承鋼所用原材料質(zhì)量提出了越來越高的要求,特別是軸承鋼的冶金質(zhì)量、碳化物的均勻性及表面脫碳深度等。本文針對(duì)國內(nèi)某廠熱軋高標(biāo)軸承鋼SUJ2存在網(wǎng)狀碳化物及脫碳層深度超標(biāo)等問題,通過對(duì)該鋼的高溫形變特征,高溫氧化和脫碳特性,控軋控冷過程中網(wǎng)狀碳化物特性的研究,分析造成該鋼質(zhì)量不穩(wěn)定的內(nèi)外部因素,為提高該鋼的質(zhì)量提供理論基礎(chǔ)和實(shí)驗(yàn)依據(jù)。主要工作內(nèi)容如下:對(duì)高標(biāo)軸承鋼SUJ2進(jìn)行單道次壓縮熱模擬實(shí)驗(yàn),研究了該鋼在800~1050°C和0.01~10 s~(-1)條件下的熱變形行為,建立了該鋼高溫?zé)嶙冃伪緲?gòu)方程,基于DMM材料模型及Ziegle-Prasad失穩(wěn)判據(jù)建立了熱加工圖,分析了工藝參數(shù)對(duì)SUJ2鋼的熱加工性能的影響。結(jié)果表明:該鋼在低溫高應(yīng)變速率,高溫高應(yīng)變速率及高溫低應(yīng)變速率區(qū)間會(huì)發(fā)生失穩(wěn)。利用熱加工圖確立該鋼的最佳熱加工區(qū)間為800~930°C,應(yīng)變速率為0.01~0.3 s~(-1)及950~1050°C,應(yīng)變速率為0.1~1 。通過高溫加熱爐對(duì)高標(biāo)軸承鋼SUJ2在1000~1220°C,不同氧流量(0.0 L/min、1.5 L/min、3 L/min)下的氧化和脫碳行為進(jìn)行研究。結(jié)果表明:單位面積氧化增重量隨著溫度的升高和時(shí)間的延長而增加,脫碳層深度隨著溫度的升高先增加后降低。氧化層中相組成由內(nèi)到外分別為Fe_(1-y)O、Fe_3O_4、Fe2O3,不同溫度和不同氧流量下氧化層中三種物相的比例不同。隨著脫碳層深度的增加,Fe_(1-y)O與Fe_3O_4的比值降低;隨著脫碳層深度的降低,Fe_(1-y)O與Fe_3O_4的比值升高。氧流量1.5L/min條件下的脫碳層深度最低。采用熱模擬機(jī)對(duì)高標(biāo)軸承鋼SUJ2進(jìn)行連續(xù)冷卻轉(zhuǎn)變實(shí)驗(yàn)和軋后網(wǎng)狀碳化物控制實(shí)驗(yàn),研究了不同冷卻速度(0~20°C/s)下的組織轉(zhuǎn)變規(guī)律和軋后冷卻速度(3~30°C/s)、終冷溫度(750~550°C)及緩冷速度(1~5°C/s)對(duì)網(wǎng)狀碳化物析出的影響。結(jié)果表明:隨著冷卻速度的增加,晶界處析出的碳化物由連續(xù)的網(wǎng)狀轉(zhuǎn)變?yōu)榘脒B續(xù)狀,抑制網(wǎng)狀碳化物析出的臨界冷卻轉(zhuǎn)變速度為8°C/s。在軋后控冷過程中,隨著冷卻速度增加,終冷溫度降低及緩冷速度增加,可以抑制網(wǎng)狀碳化物的形成,獲得具有良好性能的熱軋態(tài)索氏體組織。通過實(shí)驗(yàn)室開發(fā)的SUJ2鋼組織性能預(yù)報(bào)系統(tǒng)對(duì)網(wǎng)狀碳化物在軋制過程中的析出階段和截面上的析出節(jié)點(diǎn)進(jìn)行預(yù)報(bào)。對(duì)棒材而言,網(wǎng)狀碳化物主要在截面的1/4和1/2處形成。對(duì)于不同規(guī)格的成品材而言,網(wǎng)狀碳化物主要在精軋階段及軋后上冷床過程中或在冷床上形成。
[Abstract]:With the rapid development of high-end equipment such as rail transit, tunnel engineering, wind power and automobile, the quality of raw materials used in bearing steel is required to be higher and higher, especially the metallurgical quality of bearing steel. The uniformity of carbides and the depth of surface decarbonization. In view of the problems of reticulated carbide and decarburized layer depth in SUJ2, a high standard bearing steel hot rolled in China, the characteristics of high temperature deformation, high temperature oxidation and decarbonization, and the characteristics of reticulated carbides in controlled rolling and controlled cooling process are studied by means of high temperature deformation characteristics, high temperature oxidation and decarbonization characteristics. The internal and external factors causing the instability of the steel quality are analyzed in order to provide theoretical basis and experimental basis for improving the quality of the steel. The main contents are as follows: the thermal deformation behavior of high standard bearing steel SUJ2 under 800 ~ 1050 擄C and 0.01 ~ (- 1) 10 s ~ (- 1) was studied by single pass compression thermal simulation experiment, and the constitutive equation of high temperature thermal deformation of the steel was established. Based on DMM material model and Ziegle-Prasad instability criterion, the hot-working diagram was established and the effect of process parameters on the hot-working properties of SUJ2 steel was analyzed. The results show that the steel will lose stability at high strain rate at low temperature, high strain rate at high temperature and low strain rate at high temperature. The optimum hot working interval of the steel is 800 ~ 930 擄C, the strain rate is 0.01 ~ 0.3 s ~ (- 1) and 950 ~ 1050 擄C, and the strain rate is 0.1 渭 1. The oxidation and decarbonization behavior of high standard bearing steel SUJ2 at 1000 ~ 1220 擄C with different oxygen flux (0.0L / min, 1.5L / min, 3 L/min) was studied by high temperature heating furnace. The results show that the increase of oxidation weight per unit area increases with the increase of temperature and time, and the depth of decarburization layer increases first and then decreases with the increase of temperature. The phases in the oxide layer are Fe_ (1) O, Fe _ 2O _ 3, Fe _ 2O _ 3 and Fe _ 2O _ 3 respectively from inside to outside. The ratios of the three phases in the oxide layer at different temperatures and different oxygen flow rates are different. With the increase of decarburization depth, the ratio of Fe_ (1) O to Fe_3O_4 decreases, and with the decrease of decarburization depth, the ratio of Fe_ (1) O to Fe_3O_4 increases. The depth of decarbonization layer is the lowest under the condition of oxygen flow rate 1.5L/min. The continuous cooling transformation experiment and reticulated carbide control experiment of high standard bearing steel SUJ2 were carried out by means of thermal simulator. The microstructure transformation rule and post rolling cooling rate (3 ~ 30 擄C / s),) at different cooling rates (0 ~ 20 擄C / s) were studied. The effects of final cooling temperature (750 ~ 550 擄C) and slow cooling rate (1 ~ 5 擄C / s) on the precipitation of reticulated carbides. The results show that with the increase of cooling rate, the precipitated carbides at the grain boundary change from continuous reticulated to semi-continuous, and the critical cooling rate to restrain the precipitation of reticulated carbides is 8 擄C. In the process of controlled cooling after rolling, with the increase of cooling rate, the final cooling temperature decreases and the slow cooling rate increases, the formation of reticulated carbides can be inhibited and the hot-rolled sorbite structure with good properties can be obtained. The microstructure and property prediction system of SUJ2 steel was developed in the laboratory to predict the precipitation stage of reticulated carbides in rolling process and the precipitated nodes on the cross section of the steel. For bars, the reticulated carbides are mainly formed at 1 / 4 and 1 / 2 of the cross-section. For different types of finished products, reticulated carbides are formed during finishing and post-rolling cooling beds or on cold beds.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG142.1;TG335

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王志蒙;王玉輝;曹文全;趙錚錚;王天生;彭艷;;GCr15軸承鋼熱變形行為及加工圖[J];材料熱處理學(xué)報(bào);2017年01期

2 秦芳誠;齊會(huì)萍;李永堂;尉瀟健;;42CrMo鋼軸承環(huán)件鑄輾成形及淬回火組織性能研究[J];機(jī)械工程學(xué)報(bào);2017年02期

3 王國棟;王昭東;劉振宇;王丙興;袁國;田勇;;基于超快冷的控軋控冷裝備技術(shù)的發(fā)展[J];中國冶金;2016年10期

4 李昭昆;雷建中;徐海峰;俞峰;董瀚;曹文全;;國內(nèi)外軸承鋼的現(xiàn)狀與發(fā)展趨勢[J];鋼鐵研究學(xué)報(bào);2016年03期

5 胡磊;王雷;麻晗;;高碳鋼盤條的表面氧化與脫碳行為[J];鋼鐵研究學(xué)報(bào);2016年03期

6 田振卓;霍向東;李烈軍;陳松軍;;軋后冷卻速率對(duì)GCr15鋼棒材組織的影響[J];軋鋼;2015年06期

7 陳敏;翟蛟龍;蔡豐偉;;控軋控冷對(duì)高碳鉻軸承鋼網(wǎng)狀碳化物改善的研究[J];特鋼技術(shù);2015年03期

8 李志超;張小壘;米振莉;李輝;;合金元素V對(duì)高碳鉻軸承鋼組織和性能的影響[J];材料熱處理學(xué)報(bào);2015年07期

9 黃超;張丹;王威;周樂育;張朝磊;劉雅政;;加熱溫度和保溫時(shí)間對(duì)軸承鋼GCr15SiMn碳化物的影響[J];材料熱處理學(xué)報(bào);2015年04期

10 李舒笳;柳洋波;張瑋;孫齊松;王麗萍;;2%殘氧氣氛下硅對(duì)彈簧鋼氧化速率的影響[J];鋼鐵研究學(xué)報(bào);2015年05期

相關(guān)會(huì)議論文 前1條

1 史海生;章靖國;樊俊飛;吳杏芳;;噴射成形GCr15鋼的顯微組織與超塑性研究[A];中國特殊鋼年會(huì)2005論文集[C];2005年

相關(guān)博士學(xué)位論文 前5條

1 蔣波;盾構(gòu)機(jī)軸承套圈用鋼變形與熱處理組織性能研究[D];北京科技大學(xué);2016年

2 李輝;高碳鉻軸承鋼中碳化物演變及貝氏體相變行為[D];北京科技大學(xué);2015年

3 張丹;盾構(gòu)機(jī)用大斷面高碳鉻軸承鋼組織性能控制研究[D];北京科技大學(xué);2015年

4 侯清宇;Mg-Gd-Y合金的塑性變形特征研究[D];南京理工大學(xué);2012年

5 孫艷坤;軸承鋼熱軋組織控制機(jī)理與超快速冷卻研究[D];東北大學(xué);2009年

相關(guān)碩士學(xué)位論文 前6條

1 吳炳新;高品質(zhì)GCr15軸承鋼精煉過程中非金屬夾雜物演變規(guī)律及控制措施研究[D];武漢科技大學(xué);2015年

2 任洪敏;軸承鋼穿水冷卻工藝優(yōu)化研究[D];安徽工業(yè)大學(xué);2014年

3 郝震宇;Φ150 SAE4137大棒材軋制工藝優(yōu)化研究[D];安徽工業(yè)大學(xué);2014年

4 李凡;GCr15軸承鋼熱軋及球化退火組織性能研究[D];東北大學(xué);2014年

5 曹宇;800H合金組織演變規(guī)律與熱加工工藝研究[D];東北大學(xué);2011年

6 鄭會(huì)平;熱軋帶鋼層流冷卻過程的建模與仿真研究[D];東北大學(xué);2008年

，

本文編號(hào)：2446542