MECHANICAL BEHAVIORS AND MICRO-SHEAR STRUCTURES OF METALS WITH DIFFERENT STRUCTURES BY HIGH-SPEED COMPRESSION

doi:10.3724/SP.J.1037.2013.00634

Acta Metall Sin

2014, Vol. 50

Issue (4): 387-394 DOI: 10.3724/SP.J.1037.2013.00634

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MECHANICAL BEHAVIORS AND MICRO-SHEAR STRUCTURES OF METALS WITH DIFFERENT STRUCTURES BY HIGH-SPEED COMPRESSION

SUN Xiurong, WANG Huizhen, YANG Ping(

), MAO Weimin

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083

Cite this article:

SUN Xiurong, WANG Huizhen, YANG Ping, MAO Weimin. MECHANICAL BEHAVIORS AND MICRO-SHEAR STRUCTURES OF METALS WITH DIFFERENT STRUCTURES BY HIGH-SPEED COMPRESSION. Acta Metall Sin, 2014, 50(4): 387-394.

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Abstract

Dynamic compression tests on high manganese TRIP steel, pure copper, IF steel and armor steel were conducted on Hopkinson bar at the strain rate of 10³~10⁴ s^-1 to make comparisons of impact resistance and microstructural features. Results show that under dynamic compression, adiabatic shear bands (ASBs) do not occur easily on pure copper and IF steel. In addition, both pure copper and IF steel show a weak resistance to impact loading due to the poor work hardening capability. The ASB occurs quickly in armor steel containing martensite and the steel shows higher residual strength, which renders it suitable application in the condition of high speed deformation. TRIP steel consisting mainly of austenite has the highest work hardening rate and the α′-M induced by deformation can delay the ASBs formation and prevent the crack extension, manifesting that it is suitable for the use at high speed deformation. Elongated subgrains and low angle grain boundaries are found within the shear bands in pure copper and IF steel with weak microtextures, whereas the ASBs in both TRIP steel and armor steel demonstrate small equiaxed grains and high angle grain boundaries. Strong fcc shearing-type microtexture of {111}-{112}<110> and weak bcc shearing-type microtexture of {110}<111> are formed within ASBs of TRIP steel and armor steel respectively.

Key words: adiabatic shear band microtexture dynamic compress impact resistance

Received: 08 October 2013

ZTFLH:	TG142.33
	TG146.11

Fund: Supported by National Natural Science Foundation of China (No.51271028)

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	Xiurong SUN
	Huizhen WANG
	Ping YANG
	Weimin MAO

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00634 OR https://www.ams.org.cn/EN/Y2014/V50/I4/387

表1 3种钢的化学成分

Fig.1

Hopkinson压杆示意图及柱型样、帽型样尺寸

Fig.2

4种材料原始组织的SEM像

Fig.3

装甲钢的晶粒取向差分布图

表2 4种材料高速冲击力学参数

Fig.4

4种材料柱型样品的真应力-真应变曲线

Fig.5

4种金属帽型样品的剪切应力-时间曲线

Fig.6

4种材料帽型样品剪切区域形貌像(SEM图)及ASBs内部电子通道衬度像(ECC图)

Fig.7

TRIP钢ASBs的取向成像图和极图

Fig.8

3种材料剪切区域取向成像图和极图

Fig.9

4种材料剪切区域Σ3和Σ11晶界含量

Fig.10

4种材料剪切组织内部晶粒取向差分布图

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