【摘要】：42CrMo軸承環(huán)件是高鐵動(dòng)車(chē)和風(fēng)力發(fā)電等裝備制造領(lǐng)域關(guān)鍵承載、傳動(dòng)構(gòu)件�；诃h(huán)件鑄輾復(fù)合成形技術(shù)開(kāi)展42CrMo鋼軸承環(huán)件離心鑄造、熱輾擴(kuò)成形及淬回火試驗(yàn)研究,分析高溫變速進(jìn)給時(shí)輾擴(kuò)成形環(huán)件的微觀組織及力學(xué)性能,并對(duì)后續(xù)淬回火過(guò)程組織性能演變規(guī)律進(jìn)行探討。結(jié)果表明,成形環(huán)件沿徑向厚度區(qū)域晶粒得到細(xì)化,環(huán)件近中層和最小寬展處伴有不規(guī)則和等軸狀的粗大晶粒;強(qiáng)度、硬度值較高,塑、韌性偏差,拉伸和沖擊斷口形貌表現(xiàn)為韌窩均聚集在剪切唇上,以解理斷裂形式為主。530℃回火時(shí)沿環(huán)件壁厚方向未觀察到碳化物,塑韌性仍較低;590℃回火后析出少量細(xì)小、彌散分布的碳化物顆粒,各項(xiàng)力學(xué)性能指標(biāo)均滿足標(biāo)準(zhǔn)要求,拉伸斷口的韌窩數(shù)量多、直徑大,沖擊斷口也比530℃時(shí)的平整,韌窩分布更加均勻,使得鑄輾復(fù)合成形軸承環(huán)件的強(qiáng)度和塑韌性得到良好的配合。
[Abstract]:42CrMo bearing ring is a key bearing and transmission component in the manufacturing field of high-speed train and wind power. The 42CrMo steel bearing ring centrifugal casting, hot rolling forming and quenching and tempering experiments were carried out based on the ring casting and rolling compound forming technology. The microstructure and mechanical properties of the ring were analyzed. The evolution law of microstructure and properties during subsequent quenching and tempering was discussed. The results show that the grain size of the forming ring is refined along the radial thickness region, the coarse grain is irregular and equiaxed at the near middle layer and the minimum width of the ring, and the strength, hardness, ductility and hardness are higher, the ductility and toughness of the ring are deviated from each other. The morphology of tensile and impact fracture shows that the dimples are clustered on the shearing lips, and no carbides are observed in the direction of wall thickness of the rings during tempering at .530 鈩，

本文編號(hào)：2208903