CCT and TTT curves of Cr3 type die casting steel 4Cr3Mo2V

doi:10.13251/j.issn.0254-6051.2023.04.002

Abstract

Abstract: Continuous cooling transformation and isothermal transformation tests were carried out on new Cr3 type hot working die steel 4Cr3Mo2V by DIL805A quenching deformation dilatometer. The effect of cooling rate on the phase transformation and hardness was studied. The CCT curves and TTT curves of the Cr3 steel were drawn and compared with those of Cr5 type steel 4Cr5Mo2V. The results show that for the Cr3 steel, its Ms=320 ℃, Ac₁=795 ℃, Ac_cm=895 ℃. When continuous cooling with different speeds, pearlite transformation, bainite transformation and martensite transformation appear in the Cr3 steel respectively. Comparing with the Cr5 steel, the CCT curves of the Cr3 steel shifts to the left and the hardenability decreases. The TTT curves of Cr3 steel is double-C type, the temperature range of bainite transformation zone is 320-410 ℃, the temperature range of pearlite transformation zone is 650-750 ℃, where the “nose tip” temperature appears at about 715 ℃, and the time required for the end of the pearlite transformation is 17 882 s.

Key words: CCT curve, TTT curve, microstructure, hardness, chromium

CLC Number:

TG142.45

Li Ling, Wu Xiaochun. CCT and TTT curves of Cr3 type die casting steel 4Cr3Mo2V[J]. Heat Treatment of Metals, 2023, 48(4): 10-17.

References

[1]赵黎. 2018年中国汽车市场盘点[J]. 汽车纵横, 2019(2): 35-37.
[2]杨凯. 2014中国汽车市场回顾及2015销量预测[J]. 汽车工业研究, 2015(4): 4-11.
[3]武兵书. 中国模具工业高质量发展的回顾与展望[J]. 金属加工: 冷加工, 2021, (6): 1-3.
Wu Bingshu. Retrospect and prospect of high quality development of china mold industry[J]. Metal Working(Metal Cutting), 2021(6): 1-3.
[4]夏书文, 左鹏鹏, 吴晓春. 国内外压铸模具钢发展概述[J]. 模具制造, 2017, 17(7): 93-99.
Xia Shuwen, Zuo Pengpeng, Wu Xiaochun. Development of die-casting die steels at home and abroad[J]. Die and Mould Manufacture, 2017, 17(7): 93-99.
[5]崔崑. 中国模具钢现状及发展(Ⅰ) [J]. 机械工程材料, 2001, 25(1): 1-5, 10.
Cui Kun. Present condition and developing direction of die steels in China(Ⅰ)[J]. Materials for Mechanical Engineering, 2001, 25(1): 1-5, 10.
[6]崔崑. 中国模具钢现状及发展(Ⅱ)[J]. 机械工程材料, 2001, 25(2): 1-3, 13.
Cui Kun. Present condition and developing direction of die steels in China(Ⅱ)[J]. Materials for Mechanical Engineering, 2001, 25(2): 1-3, 13.
[7]崔崑. 国内外模具用钢发展概况[J]. 金属热处理, 2007, 32(1): 1-11.
Cui Kun. Development of die and mould steels at home and abroad[J]. Heat Treatment of Metals, 2007, 32(1): 1-11.
[8]彭程, 刘树勋, 李培杰, 等. HDM钢热处理工艺研究[J]. 金属热处理, 2002, 27(5): 3-6.
Peng Cheng, Liu Shuxun, Li Peijie, et al. Study on heat treatment process of steel HDM[J]. Heat Treatment of Metals, 2002, 27(5): 3-6.
[9]刘树勋, 李培杰, 彭程, 等. 新型压铸镁合金用热作模具钢的组织与性能[J]. 机械工程材料, 2002, 26(9): 27-30.
Liu Shuxun, Li Peijie, Peng Cheng, et al. Metallographic microstructure and mechanical properties of new type of tool steels used in magnesium die casting process[J]. Materials for Mechanical Engineering, 2002, 26(9): 27-30.
[10]吴晓春, 徐晓, 唐文军. 大型H13钢模块的力学各向异性及其热疲劳性能[C]//中国金属学会2003中国钢铁年会论文集(4), 2003: 767-772.
Wu Xiaochun, Xu Xiao, Tang Wenjun. Mechanics anisotropy and thermal fatigue behavior of large H13 steel modules[C]//Proceedings of CSM 2003 Annual Meeting (4), 2003: 767-772.
[11]闵永安, 吴晓春, 张恒华, 等. 优质H13钢大型模块的组织性能和热疲劳特性研究[C]//第一届国际机械工程学术会议论文集, 2000: 343.
MinYongan, Wu Xiaochun, Zhang Henghua, et al. Structure and mechanical properties of super quality H13 steel and its thermal fatigue behavior[C]//Proceedings of the First International Conference on Mechanical Engineering, 2000: 343.
[12]王庆亮, 徐明华, 续维, 等. 热作模具钢H13热处理技术研究[J]. 上海钢研, 2004(4): 46-50.
Wang Qingliang, Xu Minghua, Xu Wei, et al. Study on heat techniques for hot working die steel H13[J]. Shonghai Steel and Iron Research, 2004(4): 46-50.
[13]唐文军, 吴晓春, 闵永安, 等. 高温均匀化对H13钢强韧性的影响[J]. 上海金属, 2002(2): 14-17.
Tang Wenjun, Wu Xiaochun, Min Yongan, et al. Influence of homogenization on the strength and impact toughness of H13 steel[J]. Shanghai Metals, 2002(2): 14-17.
[14]韩慧慧. H13钢经济高效的预处理工艺研究[D]. 上海: 上海大学, 2014.
Han Huihui. Research on economic and efficient pretreatment process of H13 steel[D]. Shanghai: Shanghai University, 2014.
[15]刘笑莲. 高品质热作模具钢SWPH13的性能研究[J]. 热处理, 2006(2): 31-35.
Liu Xiaolian. Study on property of high-quality hot working die steel SWPH13[J]. Heat Treatment, 2006(2): 31-35.
[16]Saleh M H, Priestnerb R. Retained austenite in dual-phase silicon steels and its effect on mechanical properties[J]. Journal of Materials Processing Technology, 2001, 113: 587-593.
[17]佟倩, 吴晓春, 闵娜. 两种不同类型热作模具钢的使用性能研究[J]. 上海金属, 2010, 32(2): 12-15.
Tong Qian, Wu Xiaochun, Min Na. Investigation on the properties of two different types of hot die steels[J]. Shanghai Metals, 2010, 32(2): 12-15.
[18]曾艳, 吴晓春, 夏书文, 等. 镍元素对新型压铸模具钢热稳定性的影响[J]. 材料导报, 2017, 31(16): 72-75.
Zeng Yan, Wu Xiaochun, Xia Shuwen, et al. Influence of Ni on the thermal stability of a new die casting steel[J]. Materials Reports, 2017, 31(16): 72-75.
[19]Michaud P, Delagnes D, Lamesle P, et al. The effect of the addition of alloying elements on carbide precipitation and mechanical properties in 5% chromium martensitic steels[J]. Acta Materialia, 2007, 55(14): 4877-4889.
[20]张金祥, 欧阳希, 周健, 等. Cr含量降低对H13钢组织与力学性能的影响[J]. 材料导报, 2018, 32(8): 1323-1327.
Zhang Jinxiang, Ouyang Xi, Zhou Jian, et al. Study on microstructure and mechanical properties of H13 tool[J]. Materials Reports, 2018, 32(8): 1323-1327.
[21]朱姣, 马党参, 周健, 等. 铬含量对热作模具钢热处理工艺及热稳定性的影响[J]. 材料热处理学报, 2013, 34(10): 121-126.
Zhu Jiao, Ma Dangshen, Zhou Jian, et al. Effect of Cr content on heat treatment process and thermal-stability of hot work steel[J]. Transactions of Materials and Heat Treatment, 2013, 34(10): 121-126.
[22]吴晓春. 一种高热稳定性压铸模具钢及其制备方法: CN111020382B[P]. 2022-04-15.
[23]李凯, 胡建文, 石少坤. 42CrMo钢连续冷却转变曲线的测定与分析[J]. 金属热处理, 2020, 45(9): 237-240.
Li Kai, Hu Jianwen, Shi Shaokun. Measurement and analysis of continuous cooling transformation curves for 42CrMo steel[J]. Heat Treatment of Metals, 2020, 45(9): 237-240.
[24]张洪, 李天生, 刘新彬. 微Nb高Mo型H13钢CCT曲线的测定与分析[J]. 内燃机与配件, 2019(8): 103-106.
Zhang Hong, Li Tiansheng, Liu Xinbin. Determination and analysis of CCT curves of H13 steel with niobium microalloyed and high molybdenum[J]. Internal Combustion Engine and Parts, 2019(8): 103-106.
[25]Yang J, Gao Z, Zhang X, et al. Continuous-cooling-transformation(CCT) behaviors and fine-grained nearly lamellar(FGNL) microstructure formation in a cast Ti-48Al-4Nb-2Cr alloy[J]. Metallurgical and Materials Transactions A, 2020, 51(10): 5285-5295.
[26]Martin H, Amoako-Yirenkyi P, Pohjonen A, et al. Statistical modeling for prediction of CCT diagrams of steels involving interaction of alloying elements[J]. Metallurgical and Materials Transactions B, 2020, 52(1): 223-235.
[27]Colla V, Desanctis M, Dimatteo A, et al. Prediction of continuous cooling transformation diagrams for dual-phase steels from the intercritical region[J]. Metallurgical and Materials Transactions A, 2011, 42(9): 2781-2793.
[28]宋冬利, 顾剑锋, 胡明娟. 预硬型塑料模具钢P20和718等温转变曲线的测定与分析[J]. 金属热处理, 2003, 28(12): 27-29.
Song Dongli, Gu Jianfeng, Hu Mingjuan. Measurement and analysis of TTT diagrams of pre-hardened plastic die steels P20 and 718[J]. Heat Treatment of Metals, 2003, 28(12): 27-29.
[29]李玲, 蔡著文, 黄苏起, 等. 预处理工艺对Cr3型压铸模具钢组织性能的影响[J]. 模具工业, 2019, 45(12): 47-51.
Li Ling, Cai Zhuwen, Huang Suqi, et al. Effect of pretreatment process on microstructure and properties of Cr3 die casting die steel[J]. Die and Mould Industry, 2019, 45(12): 47-51.
[30]Park B J, Choi J M, Lee K J. Analysis of phase transformations during continuous cooling by the first derivative of dilatation in low carbon steels[J]. Materials Characterization, 2012, 64: 8-14.
[31]邹仲平, 路峰, 于浩, 等. 50Mn2V钢连铸坯CCT曲线测定及热塑性分析研究[J]. 热加工工艺, 2019, 48(2): 76-80, 86.
Zou Zhongping, Lu Feng, Yu Hao, et al. Research on determination of CCT curve and thermoplastic analysis of 50Mn2V steel continuous casting billet[J]. Hot Working Technology, 2019, 48(2): 76-80, 86.
[32]曾艳. 压铸模具钢在热机械载荷作用下的微观组织演变行为研究[D]. 上海: 上海大学, 2019.Zeng Yan. Research on microstructure evolution behavior of die-casting die steel based on thermo-mechanical loading[D]. Shanghai: Shanghai University, 2019.
[33]Béché A, Zurob H S, Hutchinson C R. Quantifying the solute drag effect of Cr on ferrite growth using controlled decarburization experiments[J]. Metallurgical and Materials Transactions A, 2007, 38(12): 2950-2955.
[34]Trzaska J, Dobrzański L A. Modelling of CCT diagrams for engineering and constructional steels[J]. Journal of Materials Processing Technology, 2007, 192: 504-510.
[35]孙宜强. Cr含量对65Mn钢淬透性的影响[J]. 金属热处理, 2020, 45(7): 163-166.
Sun Yiqiang. Effect of Cr content on hardenability of 65Mn steel[J]. Heat Treatment of Metals, 2020, 45(7): 163-166.
[36]吴楠, 崔雪飞, 魏衍广, 等. Cr含量对Ti5Mo5V3Al-Cr系合金等温相变动力学和TTT图的影响[J]. 材料工程, 2018, 46(9): 115-121.
Wu Nan, Cui Xuefei, Wei Yanguang, et al. Effect of Cr contenton isothermal transformation kinetics and TTT diagram of Ti5Mo5V3A-Cr alloys[J]. Journal of Materials Engineering, 2018, 46(9): 115-121.