基于热加工图的喷射成形含铌高速钢的热变形

doi:10.11901/1005.3093.2014.795

材料研究学报

2015, Vol. 29

Issue (7): 496-504 DOI: 10.11901/1005.3093.2014.795

本期目录 | 过刊浏览

基于热加工图的喷射成形含铌高速钢的热变形

卢林¹,侯陇刚¹(

),王和斌¹,张金祥¹,崔华¹,黄进峰¹,张永安²,张济山¹

1. 北京科技大学新金属材料国家重点实验室北京 100083
2. 北京有色金属研究总院有色金属材料制备加工国家重点实验室北京 100088

Hot Deformation of Spray-Formed Nb-Containing High Speed Steel—A Study Using Processing Map

Lin LU¹,Longgang HOU^1,^**(

),Hebin WANG¹,Jinxiang ZHANG¹,Hua CUI¹,Jinfeng HUANG¹,Yongan ZHANG²,Jishan ZHANG¹

1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
2. State Key Laboratory of Non-Ferrous Metals and Process, General Research Institute for Non-Ferrous Metals, Beijing 100088, China

引用本文:

卢林,侯陇刚,王和斌,张金祥,崔华,黄进峰,张永安,张济山. 基于热加工图的喷射成形含铌高速钢的热变形[J]. 材料研究学报, 2015, 29(7): 496-504.
Lin LU, Longgang HOU, Hebin WANG, Jinxiang ZHANG, Hua CUI, Jinfeng HUANG, Yongan ZHANG, Jishan ZHANG. Hot Deformation of Spray-Formed Nb-Containing High Speed Steel—A Study Using Processing Map[J]. Chinese Journal of Materials Research, 2015, 29(7): 496-504.

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摘要:

结合以铌代替部分钒的合金化思路和用喷射成形快速凝固技术制备出新型M3: 2高速钢, 研究了合金在950-1150℃和0.001-10 s^-1条件下的热变形。根据实验得到的真应力-真应变曲线, 基于动态材料模型(DDM)建立合金热加工图并结合动力学分析和组织观察, 将加工图分为塑性失稳区(>1 s^-1)、低应变速率区(0.001 s^-1)、低变形温度区(<1000℃)和加工安全区, 重点讨论了低应变速率区和低变形温度区内裂纹产生的机制, 并由此确定了合金可进行热加工的区间为1050-1150℃, 0.01-0.1 s^-1。为了得到晶粒细小、碳化物呈颗粒状且分布均匀的组织, 优化后的热变形加工参数为1150℃, 0.1 s^-1。喷射成形含铌M3: 2高速钢经锻造和热处理后, 其硬度和弯曲强度等性能优于同等成分的粉末冶金高速钢。

关键词 ：金属材料喷射成形, 高速钢, 热变形, 热加工图, 铌

Abstract：

The hot deformation behavior of as spray-formed Nb-containing AISI M3: 2 high speed steel has been investigated by compression tests at a temperature range of 950-1150℃ and a strain range of 0.001-10 s^-1 with 50% reduction. Processing maps were developed according to the principles of Dynamic Material Model. It was found that the flow curves assumed the classic shape of dynamic recrystallization (DRX)-rising to a peak, following a softening to a steady state. The hot working process of the steel can be carried out safely in the domain of (T_d: 1050-1150℃, : 0.01-0.1 s^-1). To obtain microstructures of the steel with fine grains and uniform distribution of fine granular carbides, the hot working process should be carried out at 1150℃ and strain rate of 0.1 s^-1. The flow instability took place when strain rates exceed 1 s^-1. After a proper hot working and heat treatment, the hardness and bending strength of the spray-formed Nb-containing M3:2 high speed steel is 67 HRC and 3467 MPa, respectively.

Key words： metal materials spray forming high speed steel hot deformation processing map niobium

收稿日期: 2014-12-31

基金资助:* 国家重点基础研究发展计划2011CB606303资助项目。

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	卢林
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https://www.cjmr.org/CN/10.11901/1005.3093.2014.795 或 https://www.cjmr.org/CN/Y2015/V29/I7/496

图1 喷射成形高速钢沉积态组织SEM像

图2 喷射成形高速钢在不同温度下的真应力-真应变曲线

图3 应变为0.6时应力与应变速率、温度的关系图

图4 喷射成形高速钢的热加工图, 阴影部分为塑性失稳区, 等高线的数字代表能量耗散效率( ε =0.6)

图5 塑性失稳区内的变形组织

图6 动态再结晶区域内的变形组织

图7 应变速率为0.1 s-1时不同温度下的变形组织

图8 应变速率为0.001 s-1下的变形组织

图9 喷射成形含铌M3:2高速钢的锻造态组织

表1 喷射成形高速钢力学性能

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