稀土元素对中碳钢组织、力学性能和渗氮的影响

doi:10.11901/1005.3093.2020.203

材料研究学报

2021, Vol. 35

Issue (1): 72-80 DOI: 10.11901/1005.3093.2020.203

研究论文

本期目录 | 过刊浏览

稀土元素对中碳钢组织、力学性能和渗氮的影响

桂伟民(

), 刘义, 张晓田, 何亮亮, 王晔, 王元栋, 贺尔康, 王梦梦

陕西法士特齿轮有限责任公司西安 710077

Effect of Rare Earth Addition on Microstructure, Mechanical Property and Nitriding Performance of a Medium Carbon Steel

GUI Weimin(

), LIU Yi, ZHANG Xiaotian, HE Liangliang, WANG Ye, WANG Yuandong, HE Erkang, WANG Mengmeng

Shaanxi Fast Gear Co. Ltd. , Xi'an 710077, China

引用本文:

桂伟民, 刘义, 张晓田, 何亮亮, 王晔, 王元栋, 贺尔康, 王梦梦. 稀土元素对中碳钢组织、力学性能和渗氮的影响[J]. 材料研究学报, 2021, 35(1): 72-80.
Weimin GUI, Yi LIU, Xiaotian ZHANG, Liangliang HE, Ye WANG, Yuandong WANG, Erkang HE, Mengmeng WANG. Effect of Rare Earth Addition on Microstructure, Mechanical Property and Nitriding Performance of a Medium Carbon Steel[J]. Chinese Journal of Materials Research, 2021, 35(1): 72-80.

全文: PDF(20527 KB) HTML

摘要:

在一种中碳钢中通过添加微量稀土元素，研究稀土微合金化对钢的微观组织、力学性能以及在渗氮热处理条件下对渗层的影响。结果表明，添加稀土后，长条状的MnS夹杂和粗大块状的Al₂O₃转变成小球状的稀土硫氧化物夹杂；铁素体的含量降低，并促进细小片层结构的珠光体形成；冲击性能提升126%以及塑性提高10%；渗氮处理后，添加稀土能显著提高表面硬度和加深有效硬化层深，明显改善表面渗层的脉状组织。

关键词 ：金属材料, 微合金化, 稀土, 力学性能, 显微组织

Abstract：

Effect of rare earth microalloying on the microstructure and mechanical property of a medium carbon steel have been investigated, focusing on the influence of rare earth on the formed surface layer after nitriding heat treatment. The results indicate that by adding rare earth elements into the test steel: the original inclusions of long strips of MnS and the coarse Al2O3 convert into the small spherical inclusions of complex rare earth sulfur oxide; the ferrite volume content is reduced ,while more finer lamellar pearlites are formed; the impact energy increases by 126% and the plasticity increases by 10%. After nitriding heat treatment, it is found that the addition of rare earth elements can significantly improve the surface hardness and nitride case depth, as well as improving the vein-like structure of the nitriding layer.

Key words： metallic materials microalloying rare earth mechanical property microstructure

收稿日期: 2020-05-29

ZTFLH:

TG142.1

作者简介: 桂伟民，男，1989年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.203 或 https://www.cjmr.org/CN/Y2021/V35/I1/72

表1 实验用钢的主要化学成分(%，质量分数)

图1 拉伸试样和夏比冲击试样示意图

图2 氮化热处理工艺示意图

图3 各类型夹杂物的数量和夹杂物的尺寸分布

图4 0RE和0.03RE试验钢中夹杂物的金相照片

图5 添加稀土的试验钢中硫化物夹杂的电子探针面扫描结果

图6 添加稀土的试验钢中氧化物夹杂的电子探针面扫描结果

表2 0RE和0.03RE试验钢的力学性能

图7 0RE和0.03RE试验钢的纵截面的金相组织和扫描电镜组织

图8 0RE和0.03RE试验钢调质和氮化热处理的金相组织和扫描组织

图9 0RE和0.03RE试验钢经氮化热处理后渗层硬度梯度曲线

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