Effect of Heat Treatment Process on Microstructure and Properties of Steel 4330MOD for Fracturing Pump Valve Body
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摘要: 为提高压裂泵阀体的强度和韧性,研究了不同热处理工艺对改进型4330钢组织及力学性能的影响。结果表明:4330MOD钢通过添加微合金元素及调质工艺优化能够提高强度和韧性。微合金元素Nb、V,正火+调质工艺能够降低晶粒尺寸,提高强韧性。4330MOD钢在550℃～700℃回火时,组织为回火索氏体组织,随回火温度的升高强度降低,韧性先升高后降低,在600℃～650℃回火强韧性匹配较好。4330MOD钢通过微合金元素添加及热处理工艺优化使晶粒尺寸及板条块宽度细小,大角度晶界比例高,从而提高了钢的强韧性。Abstract: In order to improve the strength and toughness of fracturing pump valve body, the effect of different heat treatment processes on the microstructure and mechanical properties of improved 4330 steel are studied. The results show that the strength, toughness of 4330MOD steel can be improved by adding microalloying elements and optimizing the quenching and tempering process. Microalloying elements Nb and V, normalizing and tempering process can reduce grain size and improve strength and toughness. When 4330MOD steel is tempered at 550℃~700℃, the microstructure is tempered sortensite structure, strength decreases with the increase of tempering temperature, toughness increases first and then decreases, tempering strength and toughness match well at 600℃~650℃. Through the addition of microalloying elements and optimization of heat treatment process, the grain size and the width of the strip are small, and the proportion of large Angle grain boundary is high, so as to improve the strength and toughness of the steel.
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Key words:
- heat treatment process /
- fracturing pump /
- 4330MOD /
- microstructure /
- performance
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