Abstract: The test of isothermal compressive deformation on hot-rolled product of bearing steel GCrl5 (/%: 0. 99C, 0. 31Mn, 0. 24Si, 0. 010P, 0. 003S, 1. 44Cr, 0. 01V) with strain rate 0. 1 ~3 s^-1, strain 0. 7 at 800 ~ 1 150 ℃. is carried out by using Gleeble-1500 thermal simulation machine. And the 3-demensinal thermal-mechanical coupling finite element simulation on ten passes continuous hot-rolling process for Φ70 nun bar products of bearing steel GCrl5 rolling from 200 mm X 200 mm casting billet has been engaged based on established Hensel/Spittel deformation resistance model and by using LARTRAN/SHAPE finite element simulation software. By analyzing the variation rule of stock temperature, strainstress field, spread and rolling load parameters in each pass, it is obtained that the cracks maybe occur at the comer of stock in fifth pass therefore during rolling process should reduce the strain in fifth pass to prevent formation of cracks. Comparing the simulated value and the measured value, the relative errors of width and height size of stock section at layout of each pass are respectively 0. 40% ~5. 90% and 0. 28% ~6. 11%.

摘要： 通过Gleeble-1500热模拟试验机对GCr15轴承钢(/%:0.99C,0.31Mn,0.24Si,0.010P,0.003S,1.44Cr,0.01V)热轧材进行800~1 150℃,变形速率0.1~3 s^-1,变形量0.7的等温压缩变形试验。采用已建立的Hensel/Spittel变形抗力模型,运用LARSTRAN/SHAPE有限元模拟软件对200 mm×200 mm连铸方坯连轧Φ70 mm GCr15轴承钢棒材10道次热连轧过程进行三维热力耦合有限元模拟。通过分析各道次轧件温度场、应力应变场、宽展及轧制力参数的变化规律,预测了轧件在第5道次最有可能在角部出现裂纹,因此在轧制过程应减小第5道次变形量,防止产生裂纹;各道次出口处轧件横截面宽度、高度尺寸的模拟值与实测值的相对误差分别为0.40%~5.90%和0.28%~6.11%。

关键词: 有限元模拟, 连轧, 宽展, GCr15钢, 棒材