Effects of Mo Alloying on Microstructure and Properties of Ni-20Cr Alloy

Xia Tiandong; Lü Yongchao; Wang Xiaojun; Xu Bo

doi:10.15980/j.tzzz.2019.05.022

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Effects of Mo Alloying on Microstructure and Properties of Ni-20Cr Alloy
Vol. 39, Issue 5, Pages: 540-543(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.05.022

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[1]夏天东,吕永超,王晓军,徐博.Mo合金化对Ni-20Cr合金显微组织与性能的影响[J].特种铸造及有色合金,2019,39(05):540-543.

Xia Tiandong, Lü Yongchao, Wang Xiaojun, et al. Effects of Mo Alloying on Microstructure and Properties of Ni-20Cr Alloy. [J]. Special Casting & Nonferrous Alloys 39(5):540-543(2019)
[1]夏天东,吕永超,王晓军,徐博.Mo合金化对Ni-20Cr合金显微组织与性能的影响[J].特种铸造及有色合金,2019,39(05):540-543. DOI： 10.15980/j.tzzz.2019.05.022.

Xia Tiandong, Lü Yongchao, Wang Xiaojun, et al. Effects of Mo Alloying on Microstructure and Properties of Ni-20Cr Alloy. [J]. Special Casting & Nonferrous Alloys 39(5):540-543(2019) DOI： 10.15980/j.tzzz.2019.05.022.

摘要

利用真空电弧炉制备了Mo含量为0、0.3%

0.5%和1%的Ni-20Cr合金

并使用光学显微镜、电子探针、扫描电镜、电阻仪、拉伸试验机等手段研究了其显微组织与性能。结果表明

Mo的添加可以细化Ni-20Cr合金的晶粒

同时提高其电阻率;Ni-20Cr合金的高温抗拉强度随着Mo含量的增加先升高后降低;当Mo含量为0.5%时高温抗拉强度达到最大值169MPa。同时

Mo的添加降低了Ni-20Cr合金的塑性

但是并未改变Ni-20Cr合金的断裂形式。

Abstract

Ni-20 Cr electrothermal alloys containing 0

0.3%

0.5%and 1% Mo were prepared by vacuum arc furnace.The effects of Mo addition on microstructures and properties of the Ni-20 Cr alloy were investigated by means of optical microscopy

electron probe

scanning electron microscopy

resistometer

tensile tester and Vickers hardness tester.The results reveal that the addition of Mo can refine effectively the grain size of Ni-20 Cr alloy and increase the resistivity of Ni-20 Cr alloy.With the increase of Mo content

the high temperature tensile strength of Ni-20 Cr alloy is increased firstly and then decreased.With Mo addition of 0.5%

the high temperature tensile strength of the alloy reaches the maximum value of 169 MPa.At the same time

the plasticity of Ni-20 Cr alloy is decreased

however

the fracture mode of Ni-20 Cr alloy is still plastic fracture.