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本文应用断裂力学试验和SSRT试验研究了40Cr钢的氢脆断裂特性,结果表明:40Cr钢的K_(IC)=115MPa.m~(1/2),K_(IH)=20.4MPa.m~(1/2);应变速率3.3×10~(-6)—5.5×10~(-8)·s~(-1)范围,40Cr钢具有最大的氢脆敏感性。
In this paper, the brittle fracture characteristics of 40Cr steel were studied by means of fracture mechanics and SSRT. The results show that the K IC of 40Cr steel is 115MPa.m ~ (1/2) and K IH = 20.4MPa.m ~ ( 1/2) and strain rate of 3.3 × 10 -6 -6.5 × 10 -8 s -1, 40Cr steel has the highest hydrogen embrittlement susceptibility.