Kim Nam Yong, Ko Dae-Cheol, Kim Yangjin, Han Sang Wook, Oh Il Yeong, Moon Young Hoon
Research and Development Center, Taewoong Co., Ltd., Noksansandan 27-ro, Gangseo-gu, Busan 46751, Korea.
Graduate School of Convergence Science, Pusan National University, Busandaehak-ro 63, Geumjeong-gu, Busan 46241, Korea.
Materials (Basel). 2020 Jun 29;13(13):2916. doi: 10.3390/ma13132916.
Feasibility studies have been performed on ingots with reduced hot-top heights for the cost-effective hot forging of heavy ingots. The quality of the heavy ingots is generally affected by internal voids, which have been known to be accompanied by inclusions and segregation. To guarantee the expected mechanical performance of the forged products, these voids should be closed and eliminated during the hot open die forging process. Hence, to effectively control the internal voids, the optimum hot-top height and forging schedules need to be determined. In order to improve the utilization ratio of ingots, the ingot hot-top height needs to be minimized. To investigate the effect of the reduced hot-top height on the forged products, shaft and bar products have been manufactured via hot forging of ingots having various hot-top heights. From the operational results, the present work suggests effective forging processes to produce acceptable shaft and bar products using ingots having reduced hot tops. The mechanical properties of shop-floor products manufactured from ingots with reduced hot tops have also been measured and compared with those of conventional ingot products.
针对降低热顶高度的钢锭进行了可行性研究，以实现重钢锭的经济高效热锻。重钢锭的质量通常受内部孔隙影响，已知这些孔隙会伴有夹杂物和偏析。为保证锻造产品的预期机械性能，在热模锻过程中应封闭并消除这些孔隙。因此，为有效控制内部孔隙，需要确定最佳热顶高度和锻造工艺。为提高钢锭利用率，需将钢锭热顶高度降至最低。为研究降低热顶高度对锻造产品的影响，通过对具有不同热顶高度的钢锭进行热锻，制造出了轴类和棒材产品。根据操作结果，本研究提出了使用热顶降低的钢锭生产合格轴类和棒材产品的有效锻造工艺。还测量了由热顶降低的钢锭制造的车间产品的机械性能，并与传统钢锭产品的性能进行了比较。
