摘要
针对曲轴用非调质钢C38N2轧制过程中出现的带状组织,采用高温扩散退火和控制冷却速率等热处理工艺研究消除带状组织的效果。结果表明:试样在1230℃保温120 min随炉冷却时,带状组织基本消除,呈现均匀的铁素体和珠光体组织,但试样表面氧化严重,且存在脱碳现象。试样在1230℃保温1 min,并从1050℃到500℃以0.2~0.5℃/s冷却然后空冷至室温,不存在带状组织;以0.5~2℃/s冷却时,随着冷却速度增大,带状组织变得严重;而以2~5℃/s冷却时,带状组织又逐渐消失,但组织内出现贝氏体和马氏体组织。
Aiming at banded microstructure of non-quenched and tempered C38N2 steel for crankshaft in rolling process, the effect of eliminating banded microstructure was researched by using heat treatment processes of high temperature diffusion annealing and controlled cooling rate. The results show that when the temperature of the sample is at 1230 ℃ for 120 min and cooling in furnace, the band microstructure is basically eliminated, and the microstructure of the ferrite and pearlite is presented, but the surface oxidation is serious and there is decarbonization phenomenon. There is no banded microstructure in samples at 1230 ℃ for lmin, cooling from 1050 ℃ to 500 ℃ with 0.2-0.5℃/s and then air cooled to room temperature. When cooling rate is in 0.5-2 ℃/s, with the increase of the cooling rate, the banded microstructure became serious; when the cooling rate is in 2-5 ℃/s, the banded microstructure gradually disappears, but the bainite and martensite in microstructure appear.
出处
《热加工工艺》
CSCD
北大核心
2017年第6期226-229,共4页
Hot Working Technology
关键词
C38N2钢
带状组织
高温扩散退火
冷却速率
C38N2 steel
banded microstructure
high-temperature diffusion annealing
cooling rate
