Page 62 - 机械工程材料2025年第三期

何晓波，等：回火温度对两相区淬火态40CrNiMo钢组织和力学性能的影响

FANG Q，CHEN G，WU Y B，et al. Influence of heat treatment on precipitate and mechanical properties of
treatment on microstructure and mechanical properties of 45CrNiMoV steel［J］. Transactions of Materials and
34CrNiMo6 steel［J］. Foundry Technology，2017，38（8）： Heat Treatment，2014，35（3）：127-132.
1866-1867. ［18］ 刘铭杰，周为群，董瀚，等. 回火温度对含钒 42CrMo

［15］ 郭浩，尚勇，魏金. 热处理温度对34CrNiMo6钢组织与 钢−40 ℃冲击韧性的影响 ［J］. 上海金属，2023，45（4）：

力学性能的影响［J］. 热加工工艺，2019，48（24）：170- 62-70.
173. LIU M J，ZHOU W Q，DONG H，et al. Effect
GUO H，SHANG Y，WEI J. Effects of heat treatment of tempering temperatures on impact toughness of
temperature on microstructure and mechanical properties vanadium-containing 42CrMo steel at −40 ℃［J］.
of 34CrNiMo6 steel［J］. Hot Working Technology， Shanghai Metals，2023，45（4）：62-70.

2019，48（24）：170-173. ［19］ 王宇哲，张凯，杨甘生，等. 南极钻机的耐温材料和保
［16］ 王靖博，连明洋，付雅迪，等. 回火温度对40CrNiMo调 温方式的优选［J］. 钻探工程，2023，50（增刊1）：82-89.

质钢CMT堆焊HAZ组织性能的影响 ［J］. 金属热处理， WANG Y Z，ZHANG K，YANG G S，et al.
2021，46（5）：99-103. Optimization of temperature resistant materials and
WANG J B，LIAN M Y，FU Y D，et al. Effect of insulation methods for Antarctic drill rigs［J］. Drilling
tempering temperature on HAZ microstructure and Engineering，2023，50（S1）：82-89.

properties of CMT welded 40CrNiMo quenched and ［20］ 杜畅，毕庆霞，宫新勇，等. 基于亚温淬火的40Cr强韧
tempered steel［J］. Heat Treatment of Metals，2021，46 化处理［J］. 煤矿机械，2019，40（11）：94-96.
（5）：99-103. DU C，BI Q X，GONG X Y，et al. Strengthening
［17］ 徐盛，刘雅政，周乐育，等. 热处理对45CrNiMoV钢析 and toughening treatment of 40Cr based on subcritical

出相和力学性能影响［J］. 材料热处理学报，2014，35 quenching［J］. Coal Mine Machinery，2019，40（11）：
（3）：127-132. 94-96.
XU S，LIU Y Z，ZHOU L Y，et al. Effect of heat

Effect of Tempering Temperature on Microstructure and Mechanical Properties
of Intercritical Quenched 40CrNiMo Steel

HE Xiaobo , WEI Hongyu , ZHANG Ke , YU Meng , BAI Yujing 1
2
1
1, 2
1
(1. Technology Center, Anyang Iron & Steel Group Co., Ltd., Anyang 455004, China; 2. School of Metallurgical Engineering,
Anhui University of Technology, Ma'anshan 243032, China)
Abstract: 40CrNiMo steel was treated by oil intercritical quenching at 740 ℃, and then was tempered at
different temperatures (570, 600, 630 ℃). The effects of tempering temperature on the microstructure and mechanical
properties of the test steel were investigated and compared with those of the steel treated by fully quenching at 850 ℃
and tempering. The results show that after intercritical quenching and tempering, the microstructure of the test steel
consisted of tempered sorbite, ferrite and cementite. With the increase of tempering temperature, the granular cementite
precipitated rapidly and aggregated to grow up, the recrystallization degree of α ferrite increased, and the hardness of
the test steel decreased from 203 HV to 194 HV and was lower than that of the fully quenched and tempered test steel.
Under intercritical quenching and tempering, the change of tempering temperature had no significant effect on the low-

temperature impact toughness of the test steel, and the variation range of the impact absorption energy at −20 ℃ was
4‒5 J. The impact absorption energy at −20 ℃ of the intercritical quenched and tempered test steel was higher than
that of the fully quenched and tempered test steel. The impact fracture at different tempering temperatures showed
obvious ductile fracture characteristics, and the size and number of dimples did not change much. Within the range of
test parameters, The optimal tempering temperature for the intercritical quenching and tempering treatment of the test
steel was 630 ℃; at this time, the −20 ℃ impact absorption energy of the test steel was 33 J, which met the engineering
application requirements, and the steel also had a relatively high hardness (194 HV).
Key words: 40CrNiMo steel; intercritical quenching; tempering temperature; microstructure; impact toughness
54