Transactions of Materials and Heat Treatment

Title：Controlled cooling process of 38MnVS non-quenched and tempered steel piston after forging

Authors：

Unit：

KeyWords：

ClassificationCode：TG315.2

year,vol(issue):pagenumber：2022,47(1):180-184

Abstract：

38MnVS non-quenched and tempered steel piston was cooled after forged , and the influence laws of different cooling processes on non-quenched and tempered steel piston were discussed. First, the influences of different cooling rates on the microstructure and mechanical properties of the non-quenched and tempered steel piston were analyzed, and it was concluded that the 38MnVS non-quenched and tempered steel had the best properties in all sides when pearlite and ferrite were precipitated at a cooling rate of 50-90 ℃·min-1. Secondly, the non-quenched and tempered steel piston forgings were pre-selected by a sorting device, and the pistons with qualified forging temperature were sorted out. Under four different cooling processes, the pistons were cooled. during the cooling process, the pistons were placed into the first cooling device with a cooling rate of 50-90 ℃·min-1 and cooled to 740-760 ℃. Then, through the conveying unit, the pistons were entered into the second cooling device with a cooling rate of 30-50 ℃·min-1 and cooled to 290-310 ℃. The process verification results show that the cooling system can meet the requirement of the qualification rate for pistons of users, and the piston forgings obtained have stable performances and good qualities.

Funds：

重庆市教委项目（KJQN202103409，KJQN202003406，JG201002，Z211014）

作者简介：刘江（1982-），女，硕士，讲师，工程师 E-mail：xuhaolj@mail.ustc.edu.cn 通信作者：徐皓（1979-），男，博士，教授，正高级工程师，高级技师 E-mail：379280626@163.com

Reference：

[1] 郭全喜，宋文平，赵国华,等.汽车发动机活塞的绿色铸造[J].内燃机与动力装置，2015，32（1）：64-69.

Guo Q X，Song W P，Zhao G H，et al. Green casting of automotive engine piston [J]. Internal Combustion Engine & Powerplant，2015，32（1）：64-69.

[2] 徐皓，刘江. CH1018转向节锤锻模具设计实例 [J].锻压技术，2020,45(8):179-183.

Xu H，Liu J. Example of optimal design of steering knuckle hammer forging die of CH1018[J]. Forging & Stamping Technology，2020, 45(8):179-183.

[3] 刘攀，刘荣佩，方萍.微合金非调质钢的研究与发展[J].材料导报网刊，2011，6（2）：1-4.

Liu P，Liu R P，Fang P.Research advance of alloyed nonquenched tempered steels [J].Materials Review，2011，6（2）：1-4.

[4] 汪炜，张先彬，宋加兵.非调质活塞锻后余热处理的组织和性能[J]. 金属热处理，2007，30（2）：91-92.

Wang W，Zhang X B，Song J B.Microstructure and properties of the nonquenchedtemered steel pistons heat trea ted from forging heat [J].Heat Treatment of Metals，2007，30（2）：91-92.

[5] 陈云龙，黄军峰，孙叶，等.非调质钢在履带链轨节锻造中的应用[J].金属加工:热加工，2017,(3)：49-50.

Chen Y L,Huang J F,Su Y, et al. Application of non-tempered steel in forging track link[J].MW Metal Forming, 2017,(3):49-50.

[6] 杨伟光，刘年富，董凤奎，等.非调至钢活塞销孔内壁缺陷原因分析及控制措施[J].南方金属，2018,(5):53-56.

Yang W G，Liu N F，Dong F K，et al. Analysis and control measures for inner wall defects in pin hole of piston of nonquenched and tempered steel[J].Southern Metals，2018，（5）:53-56.

[7] 岳海军. 不同锻造冷却工艺对C70S6连杆质量的影响 [J].锻造与冲压，2014，(7):38,40,42.

Yue H J. Influence of different forging cooling process on quality of C7056 connecting rod[J].Forging & Metalforming,2014,(7):38,40,42.

[8] 李海波，刘宏玉，陈浩.钒氮非调至钢的组织细化[J].材料热处理学报，2012，33（4）：85-90.

Li H B，Liu H Y，Chen H.Microstructure refinement in a nonquenched and tempered vanadium nitrogen steel[J].Transactions of Materials and Heat Treatment，2012，33（4）：85-90.

[9] 刘宏玉，刘建华，李海波，等.热变形后冷却速率对钒氮非调质钢显微组织的影响[J].机械工程材料，2009，33（8）：7-9.

Liu H Y，Liu J H，Li H B，et al.Effect of cooling rates after hot deformation on microstructure of vanadium nitrogen nonquenched and tempered steel[J].Materials for Mechanical Engineering，2009，33（8）：7-9.

[10]李芸，周小明，卢明霞，等.锻后冷却工艺对HN2154非调质钢组织与性能的影响[J].金属热处理，2010，35（7）：51-53.

Li Y，Zhou X M，Lu M X，et al.Infiuence of forging process on microstructure and properties of HN2154 microalloyed steel[J]. Heat Trea Tment of Metals，2010，35（7）：51-53.

[11]孙吉宝. 非调质钢曲轴锻件正火冷却系统及应用 [J].锻压装备与制造技术，2003,28（5）:31-32.

Sun J B.Design & application of controlled cooling system of nonhardendtempered steel crankshaft[J].China Metalforming Equipment & Manufacturing Technology，2003,28（5）:31-32.

[12]徐皓，刘江. 高强度精密钢质活塞锻造预锻模具设计及加工关键要点实践研究 [J].塑性工程学报，2021,28（5）:31-32.

Xu H，Liu J. Research on the key points of preforging die design and machining for high strength precision steel piston forging [J]. Journal of Plasticity Engineering，2021,28（5）:31-32.

[13]唐新民，陈建业，赵九根，等.非调质钢弯、直臂的开发与应用[J].金属热处理，2001，26（1）：43-45.

Tang X M，Chen J Y，Zhao J G，et al.Development and application of nonquenched and tempered steels of bending and extending arms[J].Heat Trea Tment of Metals，2001，26（1）：43-45.

[14]刘江，徐皓.基于Deform的长杆类汽车转向节锻模设计及锻造工艺生产验证[J]. 锻压技术, 2021，46（2）：9-13.

Liu J, Xu H. Forging die design and forging process production verification of long rod steering knuckle based on deform [J]. Forging & Stamping Technology，2021, 46(2): 9-13.

[15]徐皓，刘江. 长城2020转向节锻模设计及其锻造工艺生产验证[J].锻压技术，2020, 46(1)：24-28.

Xu H，Liu J. Great Wall 2020 steering knuckle forging die design and forging process production verification [J]. Forging & Stamping Technology，2020,46(1):24-28.

Service：

【This site has not yet opened Download Service】【Add Favorite】