预备热处理对508-3钢奥氏体晶粒尺寸的影响  

Effect of Pre-Heat-Treatment on Austenite Grain Size of Steel 508-3

作　　者：何西扣[1] 刘正东[1] 林肇杰[1] 

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081

出　　处：《特殊钢》2013年第4期67-69,共3页Special Steel

基　　金：国家科技重大专项基金项目资助(2010ZX06004-016)

摘　　要：试验用钢508-3(/%:0.19C、0.26Si、1.48Mn、0.009F、0.007S、0.78Ni、0.50Mo、0.003Al)由真空感应炉冶炼,50kg铸锭,经1150℃锻成Φ16 mm棒材,终锻≥900℃。研究了正火温度(900～1 200℃)和多次正火工艺(900～1 200℃1 h-900℃1 h-890℃1 h)对508-3钢奥氏体晶粒尺寸的影响。结果表明,在900～1 200℃正火时,随着正火温度升高,奥氏体晶粒尺寸出现明显粗化,奥氏体晶粒度级别由6.5级粗化到3级。随后经过900℃二次正火,钢中原粗大的奥氏体晶粒可以细化到6级,再进行890℃三次正火后,奥氏体晶粒细化不明显。多次阶梯正火处理可以细化508-3钢粗大的奥氏体晶粒,但在同一温度重复正火时,钢中晶粒细化效果不明显。Test steel 508-3 （/% ： 0. 19C, 0.26Si, 1.48Mn, 0. 009P, 0. 007S, 0.78Ni, 0.50Mo, 0. 003Al） is melted by a vacuum induction furnace and cast to 50 kg ingot, forged at 1 150℃ to φ16 mm bar, end forging≥900℃ The effect of normalizing temperature （900 - 1 200℃ ） and muhi-normalizing process （900 - 1 200 ~ 1 h-900℃ 1 h-890 1 h） on austenite grain size of steel 508-3 has been studied. Results show that as normalizing at 900 - 1 200℃ , with increasing normalizing temperature the austenite grain size of steel coarsens obviously, the rating of austenite grain coarsens fi＇om No 6.5 to No 3 ; with subsequent seco,adary nornmlizing at 900℃ the original coarse austensite grains in steel are refined to rating of No 6, then with third normalizing at 890℃ the effect of refining of austenite grains is not obvious. Multistep-normalizing treatment is available to refining the coarse austenite grains of steel 508-3, but repeating normalizing at same temperature is not obvious to refining the austenite grains in steel.

关 键 词：预备热处理 奥氏体晶粒尺寸 508-3钢 

分 类 号：TG161[金属学及工艺—热处理]