Optimization of the Quenching Process for 30CrMnSiA Alloy Steel Parts and Prevention and Control Measures for Workpiece Cracking Defects
30CrMnSiA合金钢零件淬火工艺优化及工件开裂缺陷防控对策

摘要

30CrMnSiA合金钢因强度高、淬透性好而被广泛用于航空航天及军工关键承载部件，但其淬火工艺 窗口狭窄，工件开裂问题长期未得到根本解决。本文基于该钢种的相变特性与应力演化规律，系统考察了淬 火温度、冷却介质类型、等温淬火制度及淬火-配分工艺对微观组织转变和宏观力学性能的影响。结果表 明，淬火温度控制在880~900℃、采用330~360℃等温淬火可获得下贝氏体与板条马氏体组成的复相组织，抗 拉强度保持在1550 MPa以上，冲击韧性提高30%以上，残余应力峰值显著降低。在此基础上，从冶金质量源 头管控、加热冷却过程优化、结构应力舒缓及全流程监测四个方面提出了开裂防控的综合策略，为工程实际 中30CrMnSiA 钢零件热处理质量的稳定提升提供了参考。

Abstract

30CrMnSiA alloy steel is widely used in key load-bearing components in aerospace and defense industries due to its high strength and good hardenability. However, its quenching process window is narrow, and workpiece cracking has long remained unresolved. Based on the phase transformation characteristics and stress evolution laws of this steel grade, this paper systematically investigates the effects of quenching temperature, cooling medium type, isothermal quenching system, and quenching-partitioning process on microstructural transformation and macroscopic mechanical properties. The results show that when the quenching temperature is controlled at 880–900°C and isothermal quenching at 330–360°C is adopted, a multiphase structure composed of lower bainite and lath martensite can be obtained. The tensile strength remains above 1,550 MPa, the impact toughness increases by more than 30%, and the peak residual stress is significantly reduced. On this basis, comprehensive strategies for cracking prevention and control are proposed from four aspects: source control of metallurgical quality, optimization of heating and cooling processes, structural stress relief, and whole-process monitoring. The study provides reference for the stable improvement of heat treatment quality of 30CrMnSiA steel parts in engineering practice.