Analysis of Continuous Cooling Phase Transformation during Quenching of Super-Large Plastic Mould Steel 1.2738

Zhang Zheng; Li Shaohong

doi:10.20057/j.1003-8620.N260099

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Analysis of Continuous Cooling Phase Transformation during Quenching of Super-Large Plastic Mould Steel 1.2738

Forming and Phase Transition | 更新时间：2026-10-13

- Analysis of Continuous Cooling Phase Transformation during Quenching of Super-Large Plastic Mould Steel 1.2738
- Special Steel Vol. 47, Issue 5, Pages: 106-111(2026)
- 作者机构：
  
  1.太原理工大学材料科学与工程学院，太原 030024
  2.昆明理工大学材料科学与工程学院，昆明 650093
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N260099
  CLC： TG156.1;TG142.45
- Received：29 June 2026，
  
  Revised：2026-07-28，
  
  Accepted：28 July 2026，
  
  Published：30 September 2026
- 稿件说明：
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张铮,李绍宏.1.2738超大型塑料模具钢淬火过程连续冷却相变分析[J].特殊钢,2026,47(05):106-111.

Zhang Zheng,Li Shaohong.Analysis of Continuous Cooling Phase Transformation during Quenching of Super-Large Plastic Mould Steel 1.2738[J].Special Steel,2026,47(05):106-111.
张铮,李绍宏.1.2738超大型塑料模具钢淬火过程连续冷却相变分析[J].特殊钢,2026,47(05):106-111. DOI：10.20057/j.1003-8620.N260099.

Zhang Zheng,Li Shaohong.Analysis of Continuous Cooling Phase Transformation during Quenching of Super-Large Plastic Mould Steel 1.2738[J].Special Steel,2026,47(05):106-111. DOI：10.20057/j.1003-8620.N260099.

摘要

超大型塑料模具用模块需求日益增长，为了解1 200 mm×1 300 mm×2 700 mm超大型1.2738塑料模具钢模块淬火不同位置组织构成规律，基于DEFORM软件，非破坏性的确定了大模块不同位置淬火冷速区间，以此为依据采用相变仪进行连续冷却实验，并结合金相、硬度和残余奥氏体测试结果，分析了冷速低至0.008 ℃/s时1.2738钢种的相变特性。结果显示超大型模块“水空水”淬火生产中，芯部冷速0.026 ℃/s，远低于一般轧制态中厚板和中小型模块；考虑材料综合性能，淬火冷速0.03~0.02 ℃/s是控制1.2738钢最终组织构成的下限范围，高于该范围时得到的组织以马氏体和上，下贝氏体为主，低于该范围时将得到粒状贝氏体为主的组织。

Abstract

The demand for super-large plastic mould steel blocks is growing day by day， to reveal the microstructure at different positions of a super-large 1.2738 plastic mould steel block with dimensions of 1 200 mm × 1 300 mm × 2 700 mm during quenching， the cooling rate ranges at various locations of the large block were non-destructively determined using the DEFORM software. On this basis， continuous cooling transformation tests were carried out using a dilatometer. Combined with the test results of metallography， hardness and retained austenite， the phase transformation characteristics of 1.2738 steel at an ultra-low cooling rate of 0.008 °C/s were analyzed. The results indicate that during the “water-air-water” quenching process of the super-large block， the cooling rate at the core is only 0.026 °C/s， which is far lower than that of conventional rolled medium-thick plates and small-to-medium blocks. Considering comprehensive material properties， the quenching cooling rate range of 0.02 °C/s to 0.03 °C/s is the lower limit for controlling the final microstructures of large blocks. When the cooling rate is above this range， the obtained microstructures are dominated by martensite and upper and lower bainite； when the cooling rate falls below this range， granular bainite is the primary phase.

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references

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