锻压技术

过冷奥氏体等温转变在转向轴齿预先热处理中的应用

英文标题：Application of overcooling austenite isothermal transformation in pre-heat treatment for steering shaft tooth

作者：张义帅孙红星刘丹王涛汪金保刘华

分类号：TG162.7

出版年,卷(期):页码：2019,44(9):167-171

摘要：

采用理论分析和实验研究相结合的方法，对转向轴齿在预先热处理中存在金相组织不稳定和硬度分布不均匀的现象进行了研究。结果表明：过冷奥氏体在转变过程中的冷却速度、转变温度、转变时间等技术参数是决定其组织和性能的关键。根据过冷奥氏体等温转变过程中奥氏体分解的原理和机制，借助于可以控制风量大小、吹风时间的风冷室来控制其冷却速度，冷却结束后放入等温炉进行等温组织转变。最终得到了均匀分布的F+P显微组织，实现了轴齿锻件金相组织1~2级、同批次不同转向轴齿的硬度差值小于10 HB的技术指标，为后期渗碳淬火过程中减小齿轮的热处理变形提供了技术保障。

The phenomena of unstable metallographic structure and uneven hardness distribution of steering shaft tooth during pre-heat treatment were studied by combining theoretical analysis with experimental study. The results show that the cooling speed, transformation temperature and transformation time etc. of overcooling austenite during transformation process are the key factors to determine the microstructures and properties. According to the principle and mechanism of austenite decomposition in the process of isothermal transformation for overcooling austenite, the cooling speed was controlled by controlling air volume and blowing time in air cooling chamber, and after cooling, the isothermal structure transformation process was finished in isothermal furnace. Finally, the uniformly distributed F+P microstructures were obtained, and the technical specifications of metallographic structure grade 1-2 for steering gear forgings and hardness difference less than 10 HB of different steering shaft teeth in the same batch were achieved, which provided technical guarantee for reducing heat treatment deformation of gears in subsequent carburizing and quenching process.

基金项目：

郑州市重大科技专项（152PZDZX007）

张义帅（1984-），男，博士研究生 E-mail：zhangyishuai@bit.edu.cn 通讯作者：刘华（1962-），男，博士，研究员 E-mail：pformdept@163.com

参考文献：

［1］闫冬.扇形齿轮轴热锻成形的数值模拟研究
［D］.济南:山东大学,2012.

Yan D. The Study on Numerical Simulation of Sector Gear Shaft in Hot Forging
［D］.Jinan: Shandong University,2012.

［2］宋海兵,谢军,王春宏,等.汽车液压循环球式动力转向器
［P］.中国:CN203528592U，2014-04-09.

Song H B, Xie J,Wang C H,et al. Hydraulic circulating ball type power steering gear for car
［P］.China:CN203528592U，2014-04-09.

［3］王晓春.汽车齿轮毛坯锻件各种正火工艺方式的探讨
［J］. 西南民族大学学报：自然科学版,2007,33(6):1404-1406.

Wang X C. Research on polytechnic normalizing process of motorcar gearwheel rough forge
［J］.Journal of Southwest University for Nationalities：Natural Science Edition,2007,33(6):1404-1406.

［4］刘红军.8620H齿轮锻件等温正火工艺探讨
［J］.热加工工艺,2010,39(16):154-155.

Liu H J. Discussion of isothermal normalizing technology for 8620H gear forging
［J］. Hot Working Technology,2010,39（16）:154-155.

［5］刘云旭,王淮,季长涛,等.正火-影响渗碳齿轮热处理畸变的一个重要因素
［J］.金属热处理,2005,30(3):46-49.

Liu Y X,Wang H,Ji C T,et al. Normalizing：An important factor influencing heat treatment distortion of the carburized gears
［J］. Heat Treatment of Metals, 2005,30(3):46-49.

［6］陈晖,周细应.汽车齿轮热处理工艺的研究进展
［J］.材料导报，2010,24(7):93-96，101.

Chen H, Zhou X Y. Review and progress of heat treatment process for automobile gear
［J］. Materials Review,2010,24（7）:93-96，101.

［7］王长生,罗美华,徐云珍.汽车后桥螺旋锥齿轮锻坯正火工艺对其组织和性能的影响
［J］.热加工工艺,1998,36(5):24-26.

Wang C S, Luo M H, Xu Y Z. Effect of normalizing process on structure and properties for automobile rear axle spiral bevel gear forging blank
［J］. Hot Working Technology,1998,36(5):24-26.

［8］张芳,黄华贵,杜凤山,等.40Cr钢等温转变曲线与非等温冷却过程数值分析
［J］.材料热处理学报,2009,30(2):187-191.

Zhang F,Huang H G,Du F S,et al. Simulation on isothermal transformation curves and non-isothermal kinetics
［J］. Transactions of Materials and Heat Treatment, 2009,30(2):187-191.

［9］陈涛,陈亚迪.22CrMoB钢过冷奥氏体相变规律及冷却工艺设计
［J］.锻压技术,2017,42（10）:190-194.

Chen T,Chen Y D. Under-cooled austenite phase transformation rules and design of cooling process for steel 22CrMoB
［J］. Forging ＆ Stamping Technology, 2017,42（10）:190-194.

［10］刘澄,杨晨,赵振波,等.多步连续冷却等温正火对20CrMnTiH钢锻后显微组织及性能的影响
［J］.金属热处理,2017,42(8）：93-97.

Liu C,Yang C,Zhao Z B,et al. Effect of multiple-step continuous cooling and isothermal normalizing on microstructure and mechanical properties of 20CrMnTiH forged steel
［J］.Heat Treatment of Metals,2017,42（8）:93-97.

［11］聂亚群. 低合金亚共析钢端淬试验的数值模拟的研究
［D］.上海:上海交通大学,2015.

Nie Y Q. Research on the Computer Simulation of Quenching Process of Low-alloy Hypoeutectoid Steels
［D］. Shanghai: Shanghai Jiao Tong University, 2015.

［12］王昆林.材料工程基础
［M］.北京:清华大学出版社,2003.

Wang K L. Basis of Materials Engineering
［M］. Beijing: Tsinghua University Press,2003.

［13］贺小坤,白云岭.汽车齿轮的锻造余热等温退火工艺
［J］. 金属热处理,2014,39(11):128-132.

He X K, Bai Y L. Forging residual heat isothermal annealing for automobile gear products
［J］.Heat Treatment of Metals,2014,39（11）：128-132.

［14］连福亮,彭广金,何涛,等.超细晶过共析钢的纳米球状珠光体转变
［J］.材料热处理学报,2011,32(11):53-58.

Lian F L,Peng G J,He T,et al. Nanometer spherical pearlite transformation of an ultrafine-grained hypereutectoid steel
［J］. Transactions of Materials and Heat Treatment, 2011,32(11):53-58.

［15］梁宇, 余凌锋,梁益龙. 珠光体钢微观组织与拉伸性能关系
［J］.材料热处理学报,2013,34(7):73-77.

Liang Y, Yu L F, Liang Y L. Relationship between microstructure and tensile properties of a pearlitic steel
［J］. Transactions of Materials and Heat Treatment, 2013,34(7):73-77.

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