Al对42CrMo螺栓钢淬透性的影响

doi:10.13251/j.issn.0254-6051.2020.10.032

金属热处理 ›› 2020, Vol. 45 ›› Issue (10): 164-170.DOI: 10.13251/j.issn.0254-6051.2020.10.032

Al对42CrMo螺栓钢淬透性的影响

吕超然¹, 史超², 蒋伟斌³, 刘进德⁴, 徐乐¹, 王毛球¹

1.钢铁研究总院特殊钢研究所, 北京 100081;
2.内蒙古北方重工业集团有限公司, 内蒙古包头 014033;
3.建龙北满特殊钢有限责任公司, 黑龙江齐齐哈尔 161041;
4.宁夏天地奔牛实业集团有限公司, 宁夏石嘴山 753001

收稿日期:2020-03-20 出版日期:2020-10-25 发布日期:2020-12-29
通讯作者: 徐乐,教授,硕士生导师,E-mail:xule@nercast.com
作者简介:吕超然(1994—),女,硕士研究生,主要研究方向为合金结构钢,E-mail:lvchaoran_cat@163.com。
基金资助:
国家重点研发计划(2016YFB0300104)

Effect of Al on hardenability of 42CrMo bolt steel

Lü Chaoran¹, Shi Chao², Jiang Weibin³, Liu Jinde⁴, Xu Le¹, Wang Maoqiu¹

1. Institute for Special Steels, Central Iron & Steel Research Institute, Beijing 100081, China;
2. Inner Mongolia North Heavy Industries Group Co., Ltd., Baotou Inner Mongolia 014033, China;
3. Jianlong Beiman Special Steel Co., Ltd., Qiqihaer Heilongjiang 161041, China;
4. Ningxia Tiandi Benniu Industrial Group Co., Ltd., Shizuishan Ningxia 753001, China

Received:2020-03-20 Online:2020-10-25 Published:2020-12-29

摘要/Abstract

摘要： 在42CrMo钢的基础成分上增加Al、Ti元素,通过末端淬火试验和截面硬度试验对比分析Al对42CrMo钢淬透性的影响差异,通过常规力学性能检测对比其与42CrMo钢的力学性能差异。结果表明Al、Ti元素添加可进一步提高淬透性,并且使钢的强度达到1200 MPa级,－40 ℃下KV₂≥27 J,满足低温环境下螺栓用钢的使用要求。采用化学相分析方法,对钢中析出相进行了定性、定量分析,结果表明Ti在钢中添加发挥明显固氮作用,提高了Al元素的固溶量,利用热膨胀法对比测定试验钢的等温转变曲线,证明了增加Al含量,降低了奥氏体临界转变温度,使C曲线右移,明显改善了钢的淬透性。

关键词: 42CrMo钢, 淬透性, 力学性能, 析出相, TTT曲线

Abstract: Al and Ti elements were added to re-alloy the 42CrMo steel with basic composition. The effect of Al on the hardenability of 42CrMo steel was analyzed by means of end quenching test and section hardness test. The mechanical properties of the new 42CrMo steel were compared by conventional mechanical properties. The results show that the addition of Al and Ti can further improve the hardenability, and the strength of the steel reaches 1200 MPa, and KV₂≥27 J at －40 ℃, which meets the technical requirements at low temperature environment for the wind turbine bolt steel. Through chemical phase analysis test and TTT curves measurement, it is shown that Ti added to steel exerts obvious nitrogen fixation effect. Al is mostly dissolved in steel, making C curves shift to the right, which lowers the critical transformation temperature of austenite and significantly improves the hardenability of steel.

Key words: 42CrMo steel, hardenability, mechanical properties, precipitated phase, TTT curves

中图分类号:

TG142.1

吕超然, 史超, 蒋伟斌, 刘进德, 徐乐, 王毛球. Al对42CrMo螺栓钢淬透性的影响[J]. 金属热处理, 2020, 45(10): 164-170.

Lü Chaoran, Shi Chao, Jiang Weibin, Liu Jinde, Xu Le, Wang Maoqiu. Effect of Al on hardenability of 42CrMo bolt steel[J]. Heat Treatment of Metals, 2020, 45(10): 164-170.

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Al对42CrMo螺栓钢淬透性的影响

Effect of Al on hardenability of 42CrMo bolt steel

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