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利用Gleeble-1500D型热模拟试验机对3种不同稀土Ce含量(0、0.012%和0.020%,mass fraction,%)的4145H钢进行单道次和双道次压缩实验,研究稀土对4145H钢再结晶行为影响。结果表明:单道次压缩,变形温度1050℃,变形速率为0.1s-1时3种实验钢发生动态再结晶型软化。双道次压缩实验,得出稀土含量为0、0.012%和0.020%的4145H钢奥氏体再结晶区分别在1050、1050和980℃以上;部分再结晶区分别在980℃到1050℃、900℃到1050℃及900℃到980℃之间;未再结晶区分别在980、900及900℃以下;加入稀土,提高变形温度、变形速率,增加间隙时间、变形量及减小初始奥氏体晶粒尺寸均提高了4145H钢静态再结晶体积分数;同时建立了3种实验钢的静态再结晶模型。
The 4145H steel with three different Ce contents (0,0.012% and 0.020%, mass fraction,%) was subjected to single-pass and double pass compression tests using a Gleeble-1500D thermal simulation machine. The effects of rare earth on the wear resistance of 4145H steel Effect of crystallization behavior. The results show that dynamic recrystallization softening occurs in three types of experimental steels with single pass compression, deformation temperature of 1050 ℃ and deformation rate of 0.1s-1. Two-pass compression experiments showed that the austenite recrystallization regions of 4145H steel with 0,0.012% and 0.020% rare earth content were above 1050, 1050 and 980 ℃, respectively. The partial recrystallization regions were 980 ℃ to 1050 ℃ and 900 ° C to 1050 ° C and 900 ° C to 980 ° C; and the non-recrystallized regions are below 980, 900 and 900 ° C, respectively; adding RE, increasing the deformation temperature, the deformation rate, increasing the clearance time, the deformation and reducing the initial austenite The grain size increases the static recrystallization volume fraction of 4145H steel. At the same time, static recrystallization model of three experimental steels is established.