静态不同冷却速度对球磨机钢球用钢60Mn2Cr组织的影响

Effect of Static Different Cooling Rates on Microstructures in 60Mn2Cr Steel for Steel Balls of Ball Mill

采用热模拟试验研究静态不同冷却速度对球磨机钢球用钢60Mn2Cr组织的影响。对加热到1 200℃的试样以0.5,1,2,5,10,20,30,40℃·s^(-1)等8个不同的冷却速度进行冷却试验。结果表明,不同的冷却速度能够得到不同的热膨胀曲线,不同的变形量得到不同形态的钢材组织。当冷却速度为5℃·s^(-1)时开始出现贝氏体组织,当冷却速度为10℃·s^(-1)时开始出现屈氏体组织,钢材组织从相对平衡的P+F网状逐渐过渡到非平衡的M+B微量。

The effects of static cooling rates on the microstructures in the 60Mn2Cr steel for steel balls of a ball mill were studied by thermal simulation test. Cooling tests for the samples heated to 1 200 ℃ was carried out at 8 different cooling rates, such as 0.5, 1, 2, 5, 10, 20, 30 and 40 ℃·s^(-1). The test results showed that different thermal expansion curves could be achieved by different cooling rates, while different types of microstructures in the steel could be achieved by different amount of deformation. When the cooling rate was 5 ℃·s^(-1), bainite structure began to appear, and when the cooling rate was 10 ℃·s^(-1), troostite structure began to appear, while the microstructures in the steel gradually transitioned from the relatively balanceable P +F reticular structure to the non-balanceable M+B microcomponent.