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轴承钢超快速冷却工艺热模拟研究
Thermal Simulation of Ultra-rapid Cooling Process of Bearing Steel
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- DOI:
- 作者:
- 陈胜楠 王灏旭 李壮 孙艳坤 张润奇 蔡一钦 陈朝霞 于涛 李朝华
CHEN Shengnan;WANG Haoxu;LI Zhuang;SUN Yankun;ZHANG Runqi;CAI Yiqin;CHEN Zhaoxia;YU Tao;LI Zhaohua
- 作者单位:
- 沈阳航空航天大学材料科学与工程学院 中国民航大学航空工程学院
College of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China;College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China
- 关键词:
- GCR15轴承钢 超快速冷却 等温 二次碳化物
GCr15 bearing steel ultra-rapid cooling isothermal secondary carbide
- 摘要:
- 轴承钢棒材变形后的交货状态存在高温网状二次碳化物大量快速析出、网状级别和硬度超标等严重问题。采用热模拟实验机对GCr15轴承钢棒材高温变形后进行超快冷却的热模拟实验,研究了其显微组织和硬度。结果表明,经过变形量为40%的高温变形后快速冷却至700℃停留保温,室温组织珠光体含量随等温时间延长而增多,二次碳化物在晶界处析出更加明显。在700℃等温、超快速析出和冷却,网状二次碳化物快速析出数量减少,并得到细小片层的珠光体。
Serious problems existed in the delivery state of bearing steel bar after deformation,such as rapid precipitation of high temperature reticulated secondary carbides,excessive reticulated grade and hardness.The thermal simulation experiment of ultra-rapid cooling of GCr15 bearing steel bar after high temperature deformation was carried out by thermal simulation machine,and its microstructure and hardness were studied.The results show that the pearlite content increase with the extension of isothermal time after rapid cooling to 700℃after deformation of 40%at high temperature.Secondary carbides are more obviously precipitated at grain boundaries.At 700℃isothermal,ultra-rapid precipitation and cooling,the amount of rapid precipitation of reticulated secondary carbides is reduced,and fine lamellar pearlite is obtained.