【摘要】：42CrMo軸承環(huán)件是高鐵動車和風力發(fā)電等裝備制造領域關鍵承載、傳動構件�；诃h(huán)件鑄輾復合成形技術開展42CrMo鋼軸承環(huán)件離心鑄造、熱輾擴成形及淬回火試驗研究,分析高溫變速進給時輾擴成形環(huán)件的微觀組織及力學性能,并對后續(xù)淬回火過程組織性能演變規(guī)律進行探討。結果表明,成形環(huán)件沿徑向厚度區(qū)域晶粒得到細化,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;強度、硬度值較高,塑、韌性偏差,拉伸和沖擊斷口形貌表現為韌窩均聚集在剪切唇上,以解理斷裂形式為主。530℃回火時沿環(huán)件壁厚方向未觀察到碳化物,塑韌性仍較低;590℃回火后析出少量細小、彌散分布的碳化物顆粒,各項力學性能指標均滿足標準要求,拉伸斷口的韌窩數量多、直徑大,沖擊斷口也比530℃時的平整,韌窩分布更加均勻,使得鑄輾復合成形軸承環(huán)件的強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：2208903