The sticking phenomenon during hot rolling of SUS 430 ferritic stainless steel was investigated by means of a two-disc type high-temperature wear tester. The test results indicate that sticking particles on the surfac...The sticking phenomenon during hot rolling of SUS 430 ferritic stainless steel was investigated by means of a two-disc type high-temperature wear tester. The test results indicate that sticking particles on the surfaces of high chromium steel (HiCr) and high-speed steel (HSS) rolls undergo nucleation, growth, and saturation stages. Grooves on the roll surface generated by grinding provide nucleation sites for sticking particles. The number of sticking particles on the HiCr roll surface is greater than that on the HSS roll surface. The average surface roughnesses (Ra) of HiCr and HSS rolls change from 0.502 and 0.493 μm at the initial stage to 0.837 and 0.530 μm at the saturation stage, respectively. The test further proves that the sticking behavior is strongly dependent on roll materials, and the HSS roll is more benefi- cial to prevent particles sticking compared with the HiCr roll under the same hot-rolling conditions.展开更多
采用热重法研究了中铬铁素体不锈钢的高温氧化行为,测定出不同温度条件下的氧化增重曲线,其氧化增重符合抛物线规律,由于溶质铬元素的选择性氧化形成致密的氧化层阻碍离子扩散造成实验钢的氧化激活能较高为560 k J/mol。通过氧化铁皮表...采用热重法研究了中铬铁素体不锈钢的高温氧化行为,测定出不同温度条件下的氧化增重曲线,其氧化增重符合抛物线规律,由于溶质铬元素的选择性氧化形成致密的氧化层阻碍离子扩散造成实验钢的氧化激活能较高为560 k J/mol。通过氧化铁皮表面形貌观察,在氧化铁皮表面生成部分异常长大的突起铁-铬尖晶石相,并随着氧化温度升高,有增多和长大趋势。当氧化温度为1100℃时,氧化铁皮出现了分层,氧化铁皮最外层为富铁的氧化物(Fe O和Fe3O4为主),将突起铁-铬尖晶石相包裹住。结合热轧粘辊实验结果表明,突起的铁-铬尖晶石容易划伤轧辊表面形成裂纹源,在后续循环轧制过程中急剧的冷热循环和轧制变形,促进了裂纹形成和扩展,为热轧粘辊提供了形核地点。高温轧制促进表面富铁的氧化物的生成,消除突起铁-铬尖晶石相可有效的降低热轧粘辊。展开更多
文摘The sticking phenomenon during hot rolling of SUS 430 ferritic stainless steel was investigated by means of a two-disc type high-temperature wear tester. The test results indicate that sticking particles on the surfaces of high chromium steel (HiCr) and high-speed steel (HSS) rolls undergo nucleation, growth, and saturation stages. Grooves on the roll surface generated by grinding provide nucleation sites for sticking particles. The number of sticking particles on the HiCr roll surface is greater than that on the HSS roll surface. The average surface roughnesses (Ra) of HiCr and HSS rolls change from 0.502 and 0.493 μm at the initial stage to 0.837 and 0.530 μm at the saturation stage, respectively. The test further proves that the sticking behavior is strongly dependent on roll materials, and the HSS roll is more benefi- cial to prevent particles sticking compared with the HiCr roll under the same hot-rolling conditions.
文摘采用热重法研究了中铬铁素体不锈钢的高温氧化行为,测定出不同温度条件下的氧化增重曲线,其氧化增重符合抛物线规律,由于溶质铬元素的选择性氧化形成致密的氧化层阻碍离子扩散造成实验钢的氧化激活能较高为560 k J/mol。通过氧化铁皮表面形貌观察,在氧化铁皮表面生成部分异常长大的突起铁-铬尖晶石相,并随着氧化温度升高,有增多和长大趋势。当氧化温度为1100℃时,氧化铁皮出现了分层,氧化铁皮最外层为富铁的氧化物(Fe O和Fe3O4为主),将突起铁-铬尖晶石相包裹住。结合热轧粘辊实验结果表明,突起的铁-铬尖晶石容易划伤轧辊表面形成裂纹源,在后续循环轧制过程中急剧的冷热循环和轧制变形,促进了裂纹形成和扩展,为热轧粘辊提供了形核地点。高温轧制促进表面富铁的氧化物的生成,消除突起铁-铬尖晶石相可有效的降低热轧粘辊。