新型高密度合金的组织与性能

doi:10.11868/j.issn.1001-4381.2017.001550

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摘要

基于面心立方固溶体结构和时效强化机理，设计出一种新型高密度合金NiW750。利用SEM，TEM对合金微观组织进行观察，采用分离式Hopkinson压杆实验研究合金在动态压缩条件下的特点，并将此合金与其领域常用材料超高强度钢G50及钨合金93WNiFe进行对比。结果表明：NiW750合金在3种材料中综合性能最好。在750℃/5h时效后，合金抗拉强度可达1746MPa，冲击韧度（a_kU）可达113J/cm²。在动态加载条件下，材料存在应变率硬化效应，其动态流变应力可达到2250MPa左右。试样在与中心轴线成45°方向形成绝热剪切带，在应变率约5500s^-1条件下，带宽80~150μm，过渡区较宽，避免材料剪切断裂过早出现。

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	刘冠旗
	王春旭
	刘少尊
	厉勇
	谭成文
	刘志超

关键词 ：高密度合金, 面心立方, 时效强化, 力学性能, 绝热剪切带

Abstract：

A new high density alloy NiW750 was developed, which was based on the faced-center cubic solid solution structure and aging strengthening mechanism. Microstructure of the alloy was observed by SEM and TEM. The material characteristics under dynamic compressing loading were investigated by using the split Hopkinson pressure bar test. The comparison among the NiW750, ultra high strength steel G50 and tungsten 93WNiFe was also conducted.The results show that the NiW750 high density alloy has the best comprehensive properties among three materials. After aging at 750℃/5h, the tensile strength of NiW750 can achieve up to 1746MPa, while the impact toughness (a_kU) can achieve 113J/cm². Under the condition of dynamic loading, the material shows strain rate hardening effect obviously as its dynamic flow stress can reach about 2250MPa. The adiabatic shear bands are formed within specimens in the direction of 45° to the central axis with a bandwidth of 80-150μm at the strain rate of about 5500s^-1 and a wide transition zone, so as to avoid the premature emergence of the shear fracture.

Key words： high density alloy faced-center cubic aging strengthening mechanical property adiabatic shear band

收稿日期: 2017-12-17 出版日期: 2019-08-22

中图分类号:

TG146.4

基金资助:国家重点研发计划项目(2016YFB0300104)

通讯作者: 王春旭 E-mail: wangchunxu@nercast.com

作者简介: 王春旭(1971-), 男, 教授级高级工程师, 博士, 主要从事超高强度钢及合金方面的研究工作, 联系地址:北京市海淀区高梁桥斜街13号院钢铁研究总院南院新材料大楼729(100081), E-mail:wangchunxu@nercast.com

引用本文:

刘冠旗, 王春旭, 刘少尊, 厉勇, 谭成文, 刘志超. 新型高密度合金的组织与性能[J]. 材料工程, 2019, 47(8): 154-160.
Guan-qi LIU, Chun-xu WANG, Shao-zun LIU, Yong LI, Cheng-wen TAN, Zhi-chao LIU. Microstructure and properties of a new high density alloy. Journal of Materials Engineering, 2019, 47(8): 154-160.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2017.001550 或 http://jme.biam.ac.cn/CN/Y2019/V47/I8/154

Fig.1 分离式Hopkinson压杆装置示意图

Table 1 NiW750合金与常用战斗部材料性能对比

Fig.2 NiW750合金的微观组织
(a)未时效；(b)750℃时效

Fig.3 NiW750合金中未溶物的形貌

Fig.4 未溶物能谱分析

Table 2 未溶物的化学成分

Fig.5 NiW750合金TEM形貌
(a)未时效；(b)750℃时效

Fig.6 不同材料的真应力-应变曲线
(a)NiW750未时效态；(b)NiW750在750℃时效态；(c)G50；(d)93WNiFe

Fig.7 不同材料流变应力与应变率之间的关系

Fig.8 未时效NiW750合金在5330s^-1应变率下纵截面的微观组织

Fig.9 NiW750合金在高应变率下的横截面微观组织
(a)未时效，应变率为5330s^-1；(b)750℃时效，应变率为5760s^-1

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