Static CCT Curve of Martensite Wear-Resistant Steel NM400

陈鑫; 徐光; 姚耔杉; 王俊; 魏智睿

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Static CCT Curve of Martensite Wear-Resistant Steel NM400

更新时间：2026-01-21

- Static CCT Curve of Martensite Wear-Resistant Steel NM400
- Special Steel Vol. 42, Issue 3, Pages: 63-66(2021)
- 作者机构：
  
  武汉科技大学省部共建耐火材料与冶金国家重点试验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：20 November 2020，
  
  Online First：11 November 2022，
  
  Published：11 November 2021
- 稿件说明：
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陈鑫, 徐光, 姚耔杉, et al. Static CCT Curve of Martensite Wear-Resistant Steel NM400[J]. Special Steel, 2021, 42(3): 63-66.
DOI：

陈鑫, 徐光, 姚耔杉, et al. Static CCT Curve of Martensite Wear-Resistant Steel NM400[J]. Special Steel, 2021, 42(3): 63-66. DOI：

摘要

用Gleeble3500热模拟试验机测定的连续冷却膨胀曲线

得出NM400钢临界相变点Ac

=719.4 ℃

=847.8℃

结合金相法

利用Origin软件绘制了试验钢的过冷奥氏体连续冷却转变（CCT）曲线。结果表明

随着冷却速度增大

钢的显微硬度逐渐增大

显微组织逐渐由铁素体和珠光体过渡为贝氏体和马氏体

铁素体量逐渐减少;冷速小于1℃/s珠光体含量逐渐增多

尺寸逐渐减小;冷速大于5 ℃/s

铁素体和珠光体逐渐消失

贝氏体相变量随冷速增加而减少

马氏体相变量逐渐增多。

Abstract

By Gleeble3500 thermomechanical simulator to determine the dilation curves at continuous cooling conditions

the critical transformation points of steel NM400 are Ac

=719. 4 ℃ and Ac

=847. 8 ℃，and combined with the metallographic method

the continuous cooling transformation (CCT) curves of super cooling austenite of tested steel are plotted using Origin software. The results show that with the increase of cooling rate

the microhardness of steel increases gradually

and the phase transformation gradually changes from ferrite and pearlite to bainite and martensite

and the ferrite content decreases gradually ； when the cooling rate is less than 1 ℃/s

the pearlite content increases gradually

and the grain size gradually decreases; when the cooling rate is greater than 5 ℃/s

the ferrite and pearlite phase transition disappears

and with the increase of the cooling rate the bainite phase decreases and marte

nsitic phase is gradually increasing.

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