合金元素含量波动对U78CrV钢轨珠光体转变临界冷却速率的影响
Effect of alloying elements in U78CrV rail on critical cooling rate of pearlite
张惠泽英 1高明昕 2徐林聪 3汪洋1
作者信息
- 1. 辽宁科技大学创新创业学院,辽宁鞍山 114051
- 2. 辽宁科技大学创新创业学院,辽宁鞍山 114051;辽宁科技大学机械工程与自动化学院,辽宁鞍山 114051
- 3. 辽宁科技大学机械工程与自动化学院,辽宁鞍山 114051
- 折叠
摘要
珠光体转变临界冷却速率(vc)是U78CrV钢轨热处理过程中的重要参数,但其值并不固定,而是随着合金元素含量的波动而变化.研究了主要合金元素含量对U78CrV钢轨vc的影响,建立了基于C、Mn、Si、Cr和V元素含量的vc动态预测模型.随着合金元素含量的波动,U78CrV钢轨的vc在3～6℃/s范围内变化,若不明确所生产批次钢轨的具体合金元素含量,则其热处理的冷却速率应不大于3℃/s.合金元素含量对vc的影响程度为w(Si)＞w(Mn)＞w(Cr)＞w(V)=w(C).生产时,检测钢轨的实际合金成分含量,将含量带入预测模型中得到预测的vc,以接近但不超过预测vc的速度进行冷却,有助于得到更高性能的热处理钢轨.
Abstract
A critical cooling rate(vc)plays a crucial role in a heat treatment process of U78CrV steel rails,as it significantly impacts an austenite to pearlite transformation.The vc is not a fixed parameter;rather,it varies with a fluctuation of alloying element content.The influence of the major alloying elements(C,Mn,Si,Cr,and V)on the vc of U78CrV steel rails was investigated.Moreover,a dynamic prediction model for vc based on the alloying content of C,Mn,Si,Cr,and V was established.It was found that the vc of U78CrV steel rails ranged between 3 and 6 ℃/s,corresponding to variations in alloying element content.In cases where the specific alloying element content of the steel rails of a batch was unknown,it was advisable to keep the cooling rate below 3 ℃/s.The order of influence of alloying element content on vc was as follows:w(Si)＞w(Mn)＞w(Cr)＞w(V)=w(C).During production,the actual alloy composition of the steel rails was determined,which was subsequently introduced into the predictive model presented to derive the anticipated vc.Cooling was conducted at a rate close to,but not exceeding,the predicted vc.This approach aided in producing heat-treated steel rails with higher performance.
关键词
U78CrV钢轨/合金元素/珠光体转变/临界冷却速率/预测模型Key words
U78CrV steel rail/alloying element/pearlite transformation/critical cooling rate/prediction model引用本文复制引用
基金项目
辽宁省教育厅面上资助项目(JYTMS20230951)
出版年
2024
NETL
NSTL
万方数据