大变形管线钢中F/B多相组织应变硬化行为和应力比研究*

汤忖江, 尚成嘉, 关海龙, 王学敏

Strain Hardening Behavior and Stress Ratio of High Deformability Pipeline Steel with Ferrite/Bainite Multi-phase Microstructure

TANG Cunjiang, SHANG Chengjia, GUAN Hailong, WANG Xuemin

表4 X70-X80强度级别范围内实验钢的应力比线性拟合斜率绝对值和标准差

Table 4 The absolute value of the linear fitted slope of stress ratio and standard deviation of experimental steels in the region of X70-X80 grade

The grade of experimental steels (interval of yield stress/MPa)	Slope of linear fitting (absolute value)			Standard deviation of stress ratio (sample estimation)
	R_t1.5/R_t0.5	R_t2/R_t1	R_t5/R_t1	R_t1.5/R_t0.5	R_t2/R_t1	R_t5/R_t1
X70 (485-635)	0.0025	0.0002	0.0003	0.107	0.014	0.016
X80 (555-705)	0.0006	0.0003	0.0006	0.053	0.011	0.026