热回复过程高强耐候钢Q450NQR1的高温力学性能

特殊钢 ›› 2011, Vol. 32 ›› Issue (6): 47-49.

热回复过程高强耐候钢Q450NQR1的高温力学性能

胡辉，董志华，陈登福，杨兴磊，王冠，周振宇

重庆大学材料科学与工程学院，重庆400044

收稿日期:2011-05-23 出版日期:2011-12-01 发布日期:2022-10-19
作者简介:胡辉(1988-),男.冶金、精炼和连铸研究。
基金资助:
国家大学生创新基金资助(091061160)；国家自然科学基金资助(50774105)

Elevated Temperature Mechanical Properties of High Strength Weathering Steel Q450NQR1 in Thermal Cycle Process

Hu Hui, Dong Zhihua, Chen Dengfu, Yang Xinglei, Wang Guan， Zhou Zhenyu

College of Materials Science and Engineering, Chongqing L'niversity. Chongqing 400044

Received:2011-05-23 Published:2011-12-01 Online:2022-10-19

摘要/Abstract

摘要： 在热回复条件下,采用Gleeble-1500D热/力模拟实验机,研究测试了高强耐候钢Q450NQR1(/%:0.05～0.10C、0.30～0.50Si、0.80～1.00Mn、≤0.020P、≤0.008S、0.20～0.40Cu、0.15～0.35Ni、0.40～0.60Cr)200mm×1 350 mm铸坯试样在700～1 000℃,热拉伸应变率5×10^-3 s^-1时的强度、塑性模量和断面收缩率。结果表明,随温度下降铸坯塑性模量(硬化系数)和强度增加,800℃时铸坯的强度随温度的变化速率出现明显转变;925～700℃时铸坯断面收缩率≤60%;为保证铸坯质量,在矫直过程铸坯表面温度应≥950℃。

关键词: 高强耐候钢Q450NQR1, 铸坯, 热回复, 高温力学性能

Abstract: In thermal cvcle condition, strength, plastic modulus and reduction of area high strength weathering steel Q450NQR1 200 mm x 1 35O_ nim casting slab (/%: 0. 05 - 0. 10C, 0. 30 〜0. 50Si, 0. 80 〜1.00Mn, ≤0. 020P, ≤0. 008S, 0. 20 ~ 0. 40Cu, 0. 15 〜0. 35Ni, 0. 40 - 0. 60Cr) with heat tensile strain rate 5 x 10 ^-3 s^-1 at 700 〜1 000 °C have been studied and measured by using Gleeble-1500D thermo-mechanical simulator. Results show that with decreasing temperature the plastic modulus (hardening coefficient) and strength of casting slab increase, the change rate of strength of slab with temperature obviously alters at 800 °C; the reduction of area of slab at 925 ~ 700°C is ≤60% ； in order to ensure the quality of slab, during straightening process the surface temperature of slab should be controlled ≥950 °C.

Key words: High Strength Weathering Steel Q450NQR1, Casting Slab, Thennal Cycle, Elevated Temperature Mechanical Properties

胡辉, 董志华, 陈登福, 杨兴磊, 王冠, 周振宇. 热回复过程高强耐候钢Q450NQR1的高温力学性能[J]. 特殊钢, 2011, 32(6): 47-49.

Hu Hui, Dong Zhihua, Chen Dengfu, Yang Xinglei, Wang Guan , Zhou Zhenyu. Elevated Temperature Mechanical Properties of High Strength Weathering Steel Q450NQR1 in Thermal Cycle Process[J]. Special Steel, 2011, 32(6): 47-49.

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